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Appendix I_Water Supply Assessment
Catavina Residential Development Draft Initial Study/Mitigated Negative Declaration September 2025 Appendix I Water Supply Assessment Catavina Residential Development Draft Initial Study/Mitigated Negative Declaration September 2025 This page intentionally left blank. 1 Water Supply Assessment for the Proposed CATAVINA PROJECT Prepared for: Coachella Valley Water District P.O. Box 1058 Coachella, CA 92236 Prepared by: MSA Consulting, Inc. 34200 Bob Hope Drive Rancho Mirage CA, 92270 February 2025 NATEP OSTRIC) 2 Table of Contents List of Figures ................................................................................................................................................ 3 List of Tables ................................................................................................................................................. 3 1 Summary and Requirements ............................................................................................................... 5 1.1 Regulatory Requirements .................................................................................................................. 6 1.1.1 Senate Bill 610 ............................................................................................................................. 6 1.1.2 Senate Bill 1262 ........................................................................................................................... 7 1.2 Water Management Planning Documents ........................................................................................ 7 1.2.1 Urban Water Management Planning Act ................................................................................... 7 1.2.2 Sustainable Groundwater Management Act .............................................................................. 8 1.2.3 Groundwater Replenishment ..................................................................................................... 9 2 Public Water System .......................................................................................................................... 10 2.1 Coachella Valley Water District ....................................................................................................... 10 2.1.2 Coachella Valley Water District – Potable Water Distribution Systems ................................. 11 2.2 Coachella Valley Hydrology ............................................................................................................. 12 3 Public Water System – Existing Supply and Demand ........................................................................ 14 3.1 Groundwater .................................................................................................................................... 14 3.1.1 Coachella Valley Groundwater Basin ....................................................................................... 14 3.1.2 Groundwater Demand .............................................................................................................. 16 3.1.3 Groundwater Sustainability ...................................................................................................... 16 3.2 Imported Water ................................................................................................................................ 22 3.2.1 Colorado River Water ................................................................................................................ 22 3.2.2 State Water Project ................................................................................................................... 25 3.2.3 Other SWP Water ...................................................................................................................... 26 3.3 Surface Water ................................................................................................................................... 27 3.3.1 River/Stream Diversion ............................................................................................................. 27 3.3.2 Stormwater Capture.................................................................................................................. 27 3.4 Wastewater and Recycled Water .................................................................................................... 28 3.5 Conservation..................................................................................................................................... 29 3.6 Landscape Ordinance ....................................................................................................................... 29 3.7 Water Shortage Contingency Planning ............................................................................................ 32 4 Public Water System – Projected Supply and Demand .................................................................... 33 4.1 Projected Urban Demand and Supply ............................................................................................. 33 3 4.2 Normal, Single-Dry, Multiple-Dry Year Comparison ....................................................................... 34 5 Project Description ............................................................................................................................. 37 6 Project Water Demands ..................................................................................................................... 43 6.1 Projected Indoor Residential Water Demand ................................................................................. 43 6.2 Projected Outdoor Irrigation Water Demand ................................................................................. 44 6.3 Projected Total Water Demand ....................................................................................................... 45 6.4 Projected Water Sources ................................................................................................................. 46 6.5 Conservation Measures ................................................................................................................... 46 7 Availability of Sufficient Supplies ...................................................................................................... 47 7.1 Water Supply Assessment................................................................................................................ 47 7.2 Requirement for Written Verification of Water Supply Availability .............................................. 48 8 References .......................................................................................................................................... 49 List of Figures Figure 2-1: Coachella Valley Water District Boundary and Coachella Valley Cities ................................. 11 Figure 2-2: Coachella Valley Water District Domestic Water Service Areas ............................................ 12 Figure 3-1: Coachella Valley Groundwater Basin and Subbasins ............................................................. 15 Figure 3-2: Water Level Monitoring Wells in Indio Subbasin ................................................................... 17 Figure 3-3: Historical Annual Change in Groundwater Storage in the Indio Subbasin ............................ 18 Figure 3-4: Change in Groundwater Elevation from Water Year 2008-2009 through Water Year 2022- 2023 in the Indio Subbasin ......................................................................................................................... 19 Figure 3-5: Water Level Monitoring Wells in the Mission Creek Subbasin .............................................. 20 Figure 3-6: Historical Annual Change in Groundwater Storage in the Mission Creek Subbasin……………21 Figure 3-7: Change in Groundwater Elevation from Water Year 2008-2009 through Water Year 2022- 2023 in the Mission Creek Subbasin………………………………………………………………..……………………………..…….22 Figure 5-1: Project Regional Location Map…………………………………………………..…………………………………….…38 Figure 5-2: Project Vicinity Map ................................................................................................................ 39 Figure 5-3: Project Site Plan ....................................................................................................................... 40 Figure 5-4: Project Recreation Area………………………………………………………………………………………………………41 List of Tables Table 2-1: Current and Projected Population for CVWD’s Service Area .................................................. 12 Table 2-2: Monthly Average Climate Data for Palm Springs ................................................................... 13 Table 2-3: Monthly Average Climate Data for Thermal ............................................................................ 13 Table 3-1: Groundwater Storage in the Coachella Valley Groundwater Basin ........................................ 16 Table 3-2: CVWD Groundwater Demand in the Coachella Valley Groundwater Basin ........................... 16 Table 3-3: CVWD Colorado River Entitlements (AFY) ............................................................................... 24 4 Table 3-4: Colorado River Deliveries to CVWD at the Imperial Dam/Coachella Canal ............................ 25 Table 3-5: CVWD Groundwater Recharge of Colorado River Water ........................................................ 25 Table 3-6: State Water Project Table A Allocations .................................................................................. 26 Table 3-7: State Water Project Table A Percent Allocations .................................................................... 26 Table 3-8: CVWD and DWA Groundwater Recharge ................................................................................. 26 Table 3-9: Wastewater Treated by CVWD ................................................................................................. 28 Table 3-10: Recycled Water Produced by CVWD ...................................................................................... 29 Table 3-11: Indoor Residential Water Use Standard................................................................................. 31 Table 3-12: Urban Water Shortage Contingency Plan Shortage Levels .................................................... 32 Table 4-1: CVWD Projected Urban Retail Potable Demands .................................................................... 33 Table 4-2: CVWD Projected Urban Water Supplies ................................................................................... 34 Table 4-3: Normal Year Supply and Demand Comparison ........................................................................ 34 Table 4-4: Single-Dry Year Supply and Demand Comparison .................................................................. 35 Table 4-5: Multiple-Dry Years Supply and Demand Comparison ............................................................. 36 Table 5-1: Project Land Use Summary ....................................................................................................... 42 Table 6-1: Projected Indoor Residential Water Demand .......................................................................... 43 Table 6-2: Projected Indoor Commercial and Industrial Water Demand………………………………………………44 Table 6-3: Projected Outdoor Irrigation Water Demand………………………………………………………………………44 Table 6-4: Projected Outdoor Recreational Water Demand…………………………………………………………………45 Table 6-5: Projected Total Water Demand……………………………………………………………………………………………45 Table 6-6: Projected Water Sources………………………………………………………………………………………………………46 5 1 Summary and Requirements The environmental review of Catavina (Project) is being prepared in compliance with the California Environmental Quality Act (CEQA) process. The City is the Lead Agency for the planning and environmental review of the proposed Project. The City has identified the Coachella Valley Water District (CVWD) as the Public Water System (PWS) that will supply water for the proposed Project and has requested that CVWD assist in preparing a Water Supply Assessment (WSA) as part of the environmental review for the Project. The Project is located in the central portion of the Coachella Valley, within the City of Palm Desert in Riverside County. While the site encompasses a gross acreage of 81.4 acres, the developable area is reduced to approximately 78 acres due to an existing cell tower in the southeast corner and a right-of-way dedication at the intersection of Frank Sinatra Drive and Portola Avenue. The Project proposes to develop approximately 78 acres of vacant land to include 546 residential lots of varying lot sizes: Lot Program 1 contains 88 5,000 square feet lots. Lot Program 2 contains 100 4,050 square feet lots. Lot Program 3 contains 103 3,000 square feet lots, and Lot Program 4 contains 255 6-pack cluster single family detached units at varying sizes ranging from 2,120 to 2,460 square feet. In total, approximately 40 acres will be dedicated to residential lots. The Project would also include approximately 2.8 acres of retention basins, approximately 12 acres of common open space, and approximately 21 acres of roads. A recreation area would also be constructed that would include community buildings, a community pool and spa, sport courts, and a dog park (acreage included in the 12-acre common open space). This WSA determined that the total projected water demand for the Project is 156.85 AFY, or 2.01 acre-feet per acre. This WSA demonstrates that sufficient water supplies exist, or will exist based on current water planning assumptions, to meet the projected demands of the Project, in addition to current and future projected water demands within CVWD’s service area in normal, single-dry, and multiple-dry years over a 20-year projection. This WSA will be reviewed every five years, or in the event that the water planning assumptions have changed, until the Project begins construction on all planning areas to ensure it remains accurate and no significant changes to either the Project or available water supply has occurred. Consistent with the provisions of SB 610, neither this WSA nor its approval shall be construed to create a right or entitlement to water service or any specific level of water service, and shall not impose, expand, or limit any duty concerning the obligation of CVWD to provide certain service to its existing customers or to any future potential customers. This WSA does not constitute an agreement to provide water service to the Project, and does not entitle the Project, Project Applicant, or any other person or entity to any right, priority or allocation in any supply, capacity, or facility. To receive water service, the Project will be subject to an agreement with CVWD, together with any and all applicable fees, charges, plans and specifications, conditions, and any and all other applicable CVWD requirements in place and as amended from time to time. Nor does anything in this WSA prevent or otherwise interfere with 6 CVWD’s discretionary authority to declare a water shortage emergency in accordance with the Water Code. 1.1 Regulatory Requirements This WSA provides an assessment of the availability of sufficient water supplies during normal, single-dry, and multiple-dry years over a 20-year projection to meet the projected demands of the Project, in addition to existing and planned future water demands of CVWD, as required by Senate Bill (SB) 610 and SB 1262. This WSA also includes identification of existing water supply entitlements, water rights, water service contracts, or agreements relevant to the identified water supply for the Project and quantities of water received in prior years pursuant to those entitlements, rights, contracts, and agreements. This WSA has been prepared in compliance with the requirements under SB 610 and SB 1262 by MSA Consulting, Inc. in consultation with CVWD and the City of Palm Desert. This WSA does not relieve the Project from complying with all applicable state, county, city, and local ordinances or regulations, including the CVWD Landscape Ordinance and indoor water use performance standards provided in the California Water Code (CWC). This WSA will be reviewed every five years, or in the event that the water planning assumptions have changed, until the Project begins construction on all planning areas to ensure it remains accurate and no significant changes to either the Project or available water supply has occurred. The Project applicant shall notify CVWD when construction of all planning areas begins. 1.1.1 Senate Bill 610 On January 1, 2002, Senate Bill 610 (SB 610) was enacted and codified in CWC Section 10910 et seq., requiring the preparation of a Water Supply Assessment (WSA) for certain new development projects. As stated in SB 610, the purpose of a WSA is to determine whether the PWS’s “total projected water supplies available during normal, single-dry, and multiple-dry water years during a 20-year projection will meet the projected water demand associated with the proposed project, in addition to the PWS’s existing and planned future uses, including agricultural and manufacturing uses.” CWC Section 10912 defines a “project” as any of the following: • A proposed residential development of more than 500 dwelling units; • A proposed shopping center or business establishment employing more than 1,000 persons or having more than 500,000 square feet of floor space; • A proposed commercial office building employing more than 1,000 persons or having more than 250,000 square feet of floor space; • A proposed hotel or motel, or both, having more than 500 rooms; • A proposed industrial, manufacturing, or processing plant, or industrial park, planned to house more than 1,000 persons, occupying more than 40 acres of land, or having more than 650,000 square feet of floor space; 7 • A mixed-use project that includes one or more of the projects specified in this subdivision; or • A project that would demand an amount of water equivalent to, or greater than, the amount of water required by a 500 dwelling unit project (about 250 acre-feet per year). The intent of SB 610 is to improve the link between information on water supply availability and certain land-use decisions made by cities and counties. 1.1.2 Senate Bill 1262 On January 1, 2017, Senate Bill 1262 (SB 1262) was enacted and amended CWC Section 10910, requiring that information regarding the Sustainable Groundwater Management Act (SGMA) be included in a WSA if the water supply for a proposed project includes groundwater from a basin that is not adjudicated and was designated medium- or high-priority by the California Department of Water Resources (DWR). 1.2 Water Management Planning Documents CVWD has prepared long-term planning documents to project future was use and manage the water supplies within its service area. These planning documents can be used for compliance with SB 610 and SB 1262 and are discussed in further detail in the following sections. 1.2.1 Urban Water Management Planning Act The Urban Water Management Planning Act (UWMPA) was established by Assembly Bill 797 (AB 797) on September 21, 1983, and passage of this law recognized that water is a limited resource and that efficient water use and conservation would be actively pursued throughout the State. The UWMPA requires that municipal water suppliers providing either directly or indirectly to more than 3,000 customers, or supplying more the 3,000 acre-feet per year (AFY), prepare and adopt an Urban Water Management Plan (UWMP) every five years which defines their current and future water use, source of supply, source reliability, and existing conservation measures. 1.2.1.1 Coachella Valley Water District Urban Water Management Plan CVWD prepared and adopted its 2005, 2010, and 2015 UWMPs to document CVWD’s projected water demands and plans for delivering water supplies to its water service area during normal, single-dry, and multiple-dry years over a 20-year projection. The six urban water suppliers in the Coachella Valley (CVWD, Coachella Water Authority, Desert Water Agency (DWA), Indio Water Authority (IWA), Mission Springs Water District (MSWD), and Myoma Dunes Mutual Water Company) collaboratively prepared the 2020 Coachella Valley Regional UWMP, including regional and individual agency content and other necessary elements as set forth in DWR’s 2020 UWMP Guidebook. The 2020 Coachella Valley Regional UWMP was submitted to DWR on July 1, 2021. DWR accepted CVWD’s portion of the Regional UWMP on May 17, 2022. 8 1.2.2 Sustainable Groundwater Management Act In September 2014, Governor Brown signed three bills into law: Assembly Bill 1739, Senate Bill 1319, and Senate Bill 1168, which became collectively known as the Sustainable Groundwater Management Act (SGMA), creating a framework for sustainable, local groundwater management for the first time in California history. DWR evaluated and prioritized the 515 groundwater basins identified in Bulletin 118, and 94 of these groundwater basins were designated as high- or medium-priority basins, as of December 2019, requiring them to be sustainably managed within 20 years. SGMA required local authorities to form local Groundwater Sustainability Agencies (GSAs) by June 30, 2017 to evaluate conditions in their local groundwater basins and adopt locally-based Groundwater Sustainability Plans (GSPs), or Alternatives to a GSP (Alternative Plans), tailored to their regional economic and environmental needs. As defined by DWR, the subbasins of the Coachella Valley Groundwater Basin are the Indio, Mission Creek, San Gorgonio Pass, and Desert Hot Springs Subbasins. CVWD’s service area overlies the Indio, Mission Creek, and Desert Hot Springs Subbasins. The Indio and Mission Creek Subbasins have been designated medium-priority by DWR and are subject to the requirements of SGMA. The Desert Hot Springs Subbasin has been designated very low-priority by DWR and is not subject to the requirements of SGMA. The Project is located within the Indio Subbasin, which has been designated as a medium priority groundwater basin by DWR under SGMA. 1.2.2.1 Alternative Plan for the Indio Subbasin Twenty years before the adoption of SGMA, CVWD began the development of the initial water management plan for the Coachella Valley in 1994 after recognizing the need to sustainably manage the Coachella Valley Groundwater Basin. The original planning document is the 2002 Coachella Valley Water Management Plan (CVWMP). The 2002 CVWMP was updated in 2010 and adopted in 2012. CVWD, DWA, CWA, and IWA, are the Indio Subbasin GSAs designated by DWR for their respective service areas. On December 29, 2016, CVWD, DWA, CWA, and IWA collaboratively submitted the 2010 CVWMP Update as an Alternative Plan for the Indio Subbasin, with an associated Bridge Document and supporting documents, to DWR for review and evaluation. On July 17, 2019, DWR determined that the Alternative Plan for the Indio Subbasin satisfies the objectives of SGMA and notified the Indio Subbasin GSAs that the Alternative Plan was approved, and that they would be required to submit an assessment and update of the Alternative Plan pursuant to the SGMA by January 1, 2022 and every five years thereafter. The 2022 Alternative Plan Update for the Indio Subbasin was submitted to DWR on December 29, 2021. On June 27, 2024 DWR approved the 2022 Alternative Plan Update for the Indio Subbasin finding that it continues to satisfy the objectives of SGMA. On February 1, 2018, DWR notified all GSAs who submitted Alternative Plans that they would be required to submit annual reports pursuant to SGMA by April 1, 2018 and every year thereafter. 9 CVWD, DWA, CWA, and IWA have collaboratively prepared and submitted the Indio Subbasin Annual Reports for Water Years 2016-2017 through 2022-2023. 1.2.2.2 Alternative Plan for the Mission Creek Subbasin In 2004, CVWD, DWA, and MSWD reached an agreement and created the Mission Creek Subbasin Management Committee (Management Committee). The Management Committee jointly prepared the 2013 Mission Creek-Garnet Hill Subbasin Water Management Plan (2013 MC-GH WMP). On December 29, 2016, CVWD, DWA, and MSWD collaboratively submitted the 2013 MC-GH WMP as an Alternative Plan for the Mission Creek Subbasin, with an associated Bridge Document and supporting documents, to DWR for review and evaluation. On July 17, 2019, DWR determined that the Alternative Plan for the Mission Creek Subbasin satisfies the objectives of SGMA and notified the Management Committee that the Alternative Plan was approved, and that they would be required to submit an assessment and update of the Alternative Plan pursuant to SGMA by January 1, 2022 and every five years thereafter. The 2022 Alternative Plan Update for the Mission Creek Subbasin was submitted to DWR on December 30, 2021. On June 27, 2024 DWR approved the 2022 Alternative Plan Update for the Mission Creek Subbasin finding that it continues to satisfy the objectives of SGMA. On February 1, 2018, DWR notified all GSAs who submitted Alternative Plans that they would be required to submit annual reports pursuant to SGMA by April 1, 2018 and every year thereafter. CVWD, DWA, and MSWD have collaboratively prepared and submitted the Mission Creek Subbasin Annual Reports for Water Years 2016-2017 through 2022-2023. 1.2.3 Groundwater Replenishment State Water Code (SWC) 31630-31639 provides CVWD with the authority to levy and collect water replenishment assessments to implement groundwater replenishment programs (GRPs) within its jurisdictional boundary. Groundwater replenishment is necessary to mitigate overdraft of the groundwater basin and associated undesirable results. The jurisdictional areas that benefit from the GRPs, and where CVWD levies replenishment assessments on groundwater production, are termed Areas of Benefit (AOBs). There are three AOBs within CVWD’s boundary: the Mission Creek Subbasin AOB, the West Whitewater River Subbasin AOB, and the East Whitewater River Subbasin AOB. The GRP for the West Whitewater River Subbasin AOB was formed in 1976, the GRP for the Mission Creek Subbasin AOB was formed in 2003, and the GRP for the East Whitewater River Subbasin AOB was formed in 2004. The Project is located within the West Whitewater River Subbasin AOB. 1.2.3.1 Annual Engineer’s Reports CVWD is required to prepare and present to its Board of Directors annually an Engineer’s Report on Water Supply and Replenishment Assessment reporting on the conditions of the groundwater supplies and recommend Replenishment Assessment Charges (RACs) to be levied upon groundwater production greater than 25 AFY within each AOB in accordance with SWC 31630- 10 31639. The Engineer’s Report must include the following information: a summary of the conditions of groundwater supplies; the need for replenishment; a description of the replenishment programs, including the source and amount of replenishment waters, the costs associated with the GRP, the areas directly and indirectly benefited by the GRP, and the amount of groundwater produced in each area during the prior year; and a recommendation for the RAC to be levied on each AOB. The 2024-2025 Engineer’s Report on Water Supply and Replenishment Assessment was prepared and presented to CVWD’s Board of Directors on April 23, 2024. 2 Public Water System The City is the Lead Agency for the planning and environmental review of the proposed Catavina (Project). The City has identified the Coachella Valley Water District (CVWD) as the Public Water System (PWS) that will supply water for the proposed Project and has requested that CVWD assist in preparing a Water Supply Assessment (WSA) as part of the environmental review for the Project. 2.1 Coachella Valley Water District CVWD was established in 1918 under the County Water District Act provisions of the California Water Code. CVWD provides water related services for domestic water, wastewater collection and treatment, recycled water, agricultural irrigation water, drainage management, imported water supply, groundwater replenishment, stormwater management, flood control, and water conservation. CVWD’s boundary encompasses approximately 640,000 acres as shown in Figure 2-1, mostly within Riverside County, but also extending into northern Imperial and San Diego Counties. 11 Figure 2-1: Coachella Valley Water District Boundary and Coachella Valley Cities 2.1.2 Coachella Valley Water District – Potable Water Distribution Systems CVWD has two domestic water service areas that serve potable water to its local communities: the Cove Communities system and Improvement District No. 8 (ID-8) as shown in Figure 2-2. CVWD previously had three water systems, but ID-11 was consolidated into the Cove Communities system in March 2021. CVWD had approximately 114,196 domestic water connections and served 85,014 acre-feet (AF) of water in 2023. CVWD serves all of the Cities of Rancho Mirage, Thousand Palms, Palm Desert, Indian Wells, and La Quinta, and a portion of Indio, Coachella, and Cathedral City. Other areas served with domestic water by CVWD include a portion of lands near Desert Hot Springs and the Indio Hills. CVWD also serves other unincorporated communities including Thermal, Mecca, Oasis, Desert Shores, Salton Sea Beach, Salton City, North Shore, Bombay Beach, Hot Mineral Springs, and other portions of unincorporated Riverside and Imperial Counties. The Project is located within CVWD’s Cove Communities domestic water distribution system. Io.21 7 M), $Y)]-A 11.sDi sert Hot ASpr ngs 0 2.5 562pl Basin----pint°A s7%beS ' ‘ $ 1%e ",[TL Yo.Oc“q “? Sky Valley W"SYr_22 <A L faft '’ng.o.(ocJa"3 IMount San "I I )Palm Desert _ I " ’ *i Indio/ YM3La ouinta L-d SIKSan’ pesh lOdll JacintoThomas O Mecda Mountains Hill;Mountain Or (-8699ft Jia 2,---------1 L___ I CVWD Boundary -L 3055ft Cities tre UIly-2-r c l g_L Nr w50 IhDESERT I iOT SPRINGS )L T±Sant RosaINDIAN WELLS Mounta8INDION 1.1---------LA QUINTAg u a n cs ountai PALM DESERT PALM SPRINGS i RANCHO MIRAGE Salton City U b* ■v $ Cottonwood Mountains Shavers Valley Maniobra Canyon Miles 10 Santa Rosa Reservation Borrego Badlands Turkey Flat IJ Anza Mountain Salton Sea I I .I I I I I Chuck Val C ( o.o I I 179] es on 1 L - © o Jacinto State Park - 50Idyllwild <2 |. 3 Mountains <"I o O Wy-s Mecca -1 d t-8- Santa Rosa.' - 'Mpun ta ms State I ; y Wildernes ■ ) i _ CATHEDRAL CITY _ COACHELLA ■ P =(2) Js -tr 1 iak% y . ’) Agua Caliente l I oyoteCanyon 2 CulturalPreserve tate ——..; • )y H \ .V yRivelside “V r--------- i------- L 14, Saltorea Stats--- San Bernardino Mountains v, ) (X I "“i L r A, o.o -r - • $ g> ) . th ' - . „ ' ■’ f s ," y 2 Recreation Area. Li Py ohs” San YsTdro\ ; MdvntainK ae ____ -111L-u— 12 Figure 2-2: Coachella Valley Water District Domestic Water Service Areas The 2020 Regional UMWP projected that population in CVWD’s urban water service area would increase as shown in Table 2-1. Table 2-1: Current and Projected Population for CVWD’s Service Area Population Served 2020 2025 2030 2035 2040 2045 268,952 292,077 315,202 338,274 360,813 383,300 Source: 2020 Coachella Valley Regional Urban Water Management Plan 2.2 Coachella Valley Hydrology The bulk of natural groundwater replenishment comes from runoff from the adjacent mountains. Climate in the Coachella Valley is characterized by low humidity, high summer temperatures, and mild dry winters. Average annual precipitation varies from 3 to 6 inches of rain on the Coachella Valley floor to more than 30 inches in the surrounding mountains. Most of the precipitation occurs between December and February, except for summer thundershowers. Prevailing winds in the area are usually gentle, but occasionally increase to velocities as high as 30 miles per hour or more. Mid-summer temperatures commonly exceed 100 degrees Fahrenheit (oF), frequently AeTs —s “A4 258 5 MWey,2ron c :z. 2061NT%1)Y-aw. ‘sN,sis' (M 3 sVh1daoWn’Uoo B "XHdJ#E /eh l aMl %J i e tHt243 . j4 ah : 1 ..r “d '■ t;n )72)1 —at LNy,( Ug3 :.1 ?ValI CoveComm. nity Water Service Area • ,4 F( ove Corn i. nily Ju siit lione Area l y ID-8 Water Service Area ID-S surisdicioral Area NA 02s - Miles 10 - as 0 ‘f ... ....... .. G 2 i‘‘s y ' 2 i — ue ‘ ■ -yirkn ' ,1 V " i APMe PAWTt F idy ■22)% 22i t .J — o ’ U w -) te “it“Ae P ■ w ; . 13 reach 110 oF, and periodically reach or exceed 120 oF, and the average winter temperature is approximately 60 oF as shown in Table 2-2 and Table 2-3. Table 2-2: Monthly Average Climate Data for Palm Springs Source: 2020 Coachella Valley Regional Urban Water Management Plan 1 National Weather Service Forecast, Station Palm Springs Airport, 1998-2020 2 CIMIS Station 208 – La Quinta II, 2007-2020 Table 2-3: Monthly Average Climate Data for Thermal Source: 2020 Coachella Valley Regional Urban Water Management Plan 1 National Weather Service Forecast, Station Desert Resorts Regional Airport, 1990-2020 2 CIMIS Station 218 – Thermal South, 2010-2020 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Max (oF)1 Min (oF)1 Rain (in)1 ETo (in)2 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Max (F) 1 Min (F) 1 Rain (in)1 ETo (in) 2 14 3 Public Water System – Existing Supply and Demand Currently, all of Coachella Valley Water District’s (CVWD’s) urban potable water uses are supplied using groundwater. In addition to groundwater, CVWD has imported water supplies from the State Water Project (SWP) and the Colorado River, and recycled water from water reclamation plants. These imported and recycled water supplies are used to meet CVWD’s non-potable water demands and to replenish the groundwater basin. 3.1 Groundwater Groundwater is the principal source of potable supply in the Coachella Valley and CVWD obtains groundwater from both the Indio and Mission Creek Subbasins of the Coachella Valley Groundwater Basin. CVWD has the legal authority to manage the groundwater basin within its boundaries under the County Water District Law (California Water Code section 30000, et seq.) and as a Groundwater Sustainability Agency (GSA) under the Sustainable Groundwater Management Act (SGMA). Groundwater, to be supplied to the Project, is also used by other domestic water suppliers and private pumpers for crop irrigation, fish farms, duck clubs, golf course irrigation, greenhouses, and industrial uses in the Coachella Valley. 3.1.1 Coachella Valley Groundwater Basin The Coachella Valley Groundwater Basin is bounded on the north and east by the San Bernardino and Little San Bernardino Mountains, on the south and west by the Santa Rosa and San Jacinto Mountains, and on the south by the Salton Sea. At the west end of the San Gorgonio Pass, between Beaumont and Banning, the basin boundary is defined by a surface drainage divide separating the Coachella Valley Groundwater Basin from the Beaumont Groundwater Basin of the Upper Santa Ana Drainage Area. The southern boundary is formed primarily by the watershed of the Mecca Hills and by the northwest shoreline of the Salton Sea running between the Santa Rosa Mountains and Mortmar. Between the Salton Sea and Travertine Rock, at the base of the Santa Rosa Mountains, the southern boundary crosses the Riverside County Line into Imperial and San Diego Counties. Although there is interflow of groundwater throughout the Coachella Valley Groundwater Basin, fault barriers, constrictions in the basin profile, and areas of low permeability limit and control movement of groundwater. Based on these factors, the Coachella Valley Groundwater Basin has been divided into subbasins and subareas as described by DWR in 1964 and 2003, and by the United States Geological Survey (USGS) in 1974. 3.1.1.1 Coachella Valley Groundwater Basin – Subbasins As shown on Figure 3-1, the subbasins of the Coachella Valley Groundwater Basin are the Indio, Mission Creek, San Gorgonio Pass, and Desert Hot Springs Subbasins. The subbasins are defined without regard to water quantity or quality. They delineate areas underlain by formations which 15 readily yield stored groundwater through water wells and offer natural reservoirs for the regulation of water supplies. The boundaries between subbasins within the Coachella Valley Groundwater Basin are generally defined by faults that impede the lateral movement of groundwater. Minor subareas have also been delineated based on one or more of the following geologic or hydrologic characteristics: types of water-bearing formations, water quality, areas of confined groundwater, forebay areas, groundwater divides, and surface drainage divides. Figure 3-1: Coachella Valley Groundwater Basin and Subbasins Source: Indio Subbasin Annual Report for Water Year 2022-2023 The following is a list of the subbasins in the Coachella Valley Groundwater Basin as designated by DWR in Bulletin 118: • Indio Subbasin (Subbasin 7-21.01) • Mission Creek Subbasin (Subbasin 7-21.02) • San Gorgonio Pass Subbasin (Subbasin 7-21.03) • Desert Hot Springs Subbasin (Subbasin 7-21.04) - San Bernardino Mountains-ucaipa/I II Hol 5___:0tom Banning" *Ci White Water N.Scale in MilesCabazon X %) Palm Springs I) ¥%X %Hemet ■Idyll wil d s %Indi% La Quinta Coachella Thermal < Mecca 7 &,V Beach% %, )SaltonOasis Riverside Riverside San Diego ImperialK S (111).DesertShores Saltont.Sea Beach Palomar Mountain -January 2024| | Indio Subbasin | | Chocolate Valley Groundwater Basin----------------------------Fault Line • San Gorgonio Pass Subbasin [ | Orocopia Valley Groundwater Basin [_______________ J California County West Salton Sea Groundwater Basin San Bernardino Riverside Orocopia Valley Groundwater Basin Mountain i. Desert Hot Springs \ North Palm —Springs Mecca , Hills Coachella Valley Groundwater Basin (Mission Creek Subbasin) Coachella Valley Groundwater Basin (Desert Hot Springs Subbasin) Thousand Palms Desert Y Camp. Chocolate Valley Groundwater Basin Coachella Valley Groundwater Basin (Indio Subbasin) Figure 1-1 Coachella Valley Groundwater Basin and Subbasins TODDEGROUNDWATER Bermuda Dunes Palm Desert Indian Wells‘— ------- e6 .t N the Ir .1 - City 5X Rancho “ ) Mirage ‘s- s 1, st Coachella Valley $ Groundwater Basin (San Gorgonio Pass Subbasin) ..s Highland i .SPFg 5 V J _ Mission Creek Subbasin Desert Hot Spnngs Subbasin West Salton Sea Groundwater Basin 16 DWR designated the Indio, Mission Creek, and San Gorgonio Pass Subbasins as medium-priority, and the Desert Hot Springs Subbasin as very low priority. None of the subbasins are adjudicated or in a state of overdraft. In 1964, DWR estimated that the subbasins in the Coachella Valley Groundwater Basin contained approximately 39,200,000 acre-feet (AF) of water in the first 1,000 feet below the groundwater surface. The capacities of the subbasins are shown in Table 3-1. Table 3-1: Groundwater Storage in the Coachella Valley Groundwater Basin Indio Subbasin Palm Springs Subarea 4,600,000 Thousand Palms Subarea 1,800,000 Oasis Subarea 3,000,000 Garnet Hill Subarea 1,000,000 Thermal Subarea 19,400,000 Mission Creek Subbasin 2,600,000 San Gorgonio Subbasin 2,700,000 Desert Hot Springs Subbasin 4,100,000 Source: DWR Bulletin 108 (1964) 1 First 1,000 feet below ground surface. (DWR, 1964) 3.1.2 Groundwater Demand Groundwater is the principal source of potable supply in the Coachella Valley and CVWD obtains groundwater from both the Indio and Mission Creek Subbasins of the Coachella Valley Groundwater Basin. CVWD’s groundwater demand in the Coachella Valley Groundwater Basin for 2018 through 2023 is shown in Table 3-2. Table 3-2: CVWD Groundwater Demand in the Coachella Valley Groundwater Basin Indio Subbasin 96,176 93,130 96,661 98,484 97,106 90,374 Mission Creek Subbasin 2,786 2,642 3,182 3,062 2,960 2,687 3.1.3 Groundwater Sustainability Long-term sustainability is typically assessed based on changes in groundwater storage over a period on the order of ten to twenty years that includes wet and dry periods. 3.1.3.1 Indio Subbasin The 2022 Indio Subbasin Alternative Plan Update identified 57 Key Wells across the subbasin to represent local groundwater levels, shown in Figure 3-2. The plan set metrics to demonstrate sustainability, including a Minimum Threshold (MT) at each Key Well. MTs are numeric values 17 used to define undesirable results under SGMA. In WY 2022-2023, water levels in all 57 Key Wells remained above their respective MTs. This confirms that the significant undesirable results of chronic lowering of groundwater levels, depletion of groundwater storage, and potential subsidence are not occurring in the Indio Subbasin. Figure 3-2: Water Level Monitoring Wells in the Indio Subbasin Source: Indio Subbasin Annual Report for Water Year 2022-2023 Figure 3-3 shows the historical annual change in groundwater storage from 1970 through Water Year (WY) 2022-2023 in the Indio Subbasin. The figure also shows annual inflows, outflows, groundwater production, and 10-year and 20-year running-average change in groundwater storage. During periods of high artificial recharge, the change in storage tends to be positive. In dry years or periods of high groundwater pumping, the change in storage can be negative. As shown in Figure 3-3, annual inflows to the Indio Subbasin are highly variable with years of high inflows corresponding to wet years when SWP delivery volumes were greater. Higher inflows in the mid-1980s occurred when the Metropolitan Water District of Southern California (MWD) commenced large-scale advanced water deliveries to the Indio Subbasin. After a period of decline, both the 10-year and 20-year running-average change in storage have shown positive KW_001o o 9 KW_002R 8.90 0 6 O Scale in MilesKW_015 O O O C0 RiO O<oo O oo °020.COo KW_038KW.034 OKW_039KW_0330— KW C 8© ’ V0 O ( °O KW_040ooKW_041cDKW_037 KW_045 O KW_049 O OKW_053 — -O KW_052 Monitoring Agency Coachella Valley Water District 52 247 299 Coachella Water Authority0 4 O Desert Water Agency 4 32 36 KW_057 Indio Wate r Authority 25 26 Total 57 308 365 January 2024 Riverside San Diego Riverside Imperial KW032 L KW_036 KW_025 KW_026 Key Wells Monitored 2° Total Wells Monitored ° .003 Additional Wells Monitored KW_051 O O C OKW016 2O OQ KW_042 o KW_023 KW_022 - KW_018 KW_056 ( --------- O O8 KW_0300 \ oOo O O oo°gKW_007 TODD GROUNDWATER O Key Well o Other Monitored Wells • Indio Subbasin ••] California County KW_027 KW 029 S ■KW 028 KW-004O — ss & 1() o/ KW 047 KW_035 -o °6 O KW_046 KW050 O O 1 N o ■ % “CoKW-044 0Q 98 09 Figure 3-1 Elevation Monitoring Well Locations in the Indio Subbasin KW_011s 2/ \Kw010 / 4- Y KW_012 ) KW_017 1 KW_019 KW_021 KW_054 O KW.043O ° 0 KW_048Co Oo ooze JOKw.824 8 8 822,3884° .A*P " KW_055 OC 2a KW 008 KW 013.9.0 CO - o 00-00 OKW_014 18 trends since 2009. The 10-year and 20-year running-averages have been positive since 2017 and 2023 respectively. Figure 3-3: Historical Annual Change in Groundwater Storage in the Indio Subbasin Source: Indio Subbasin Annual Report for Water Year 2022-2023 As shown in Figure 3-4, groundwater levels have increased significantly in the Indio Subbasin from WY 2008-2009 to WY 2022-2023. The Indio Subbasin Annual Report uses 2009 water levels as a metric of sustainability because historical low groundwater levels occurred in the years around 2009 throughout most of the Indio Subbasin. The Indio Subbasin shows a long-term positive trend in sustainability resulting from implementation of the Indio Subbasin Alternative Plan. 700,000 600.000 500,000 400,000 300,000 200.000 100,000 0 -100,000 -200,000 co O Note: Values shown prior to 2017 are on a calendar year basis. Letters below the years indicate Sacramento Valley Water Year Type:W= WetA = Above NormalB = Below NormalD=DryC = Critically Dry WWBAWWCCABADWWWDWDCDCCCACWWWWWADDABAWDCDBWBDCCBWBWDDCW Water Year OIN03Ir000IN0(m000MN0I@m000*N0Im000wN0ImOOQ.N0 FIIIFFIIEFOO0000000000000000OO2O2@O2Q@2---E*EIIENNNN 0.0000000000000000000009000000GGOGCCGCCCCCCCCCCCCCCCCC vVvYvv*YPYY**vYYPYYYYYYYYYYUvvCNNNNNNNNNNNNNNNNNNNNNNN N. Annual Inflows 10-year Average Change in Storage Annual Ouflows 20-year Average Change in Storage Groundwater Production Annual Change in Storage January 2024 TODDE GROUNDWATER Figure 7-2 Historical Annual Change in Groundwater Storage in the Indio Subbasin Ac r e - F e e t 19 Figure 3-4: Change in Groundwater Elevation from Water Year 2008-2009 through Water Year 2022-2023 in the Indio Subbasin Source: Indio Subbasin Annual Report for Water Year 2022-2023 3.1.3.2 Mission Creek Subbasin The 2022 Mission Creek Subbasin Alternative Plan Update identified nine Key Wells across the subbasin to represent local groundwater levels, as shown in Figure 3-5. The plan set MTs at each Key Well to demonstrate sustainability. In WY 2022-2023, water levels in all nine Key Wells remained above their respective MTs, as shown in the hydrographs in Figure 3-5. This confirms that the significant undesirable results of chronic lowering of groundwater levels, depletion of groundwater storage, and potential subsidence are not occurring in the Mission Creek Subbasin. > 100 (increase) 80 to 100 60 to 80 40 to 60 20 to 40 10 to 20 5 to 10 0-5 -5 toO -10 to -5 -20 to-10 13-Year Change (Feet) o M3 5 4 •20 J 23.9 404 -36 •16 3 132“•28.3 V 833 ’ s• 38.2 NJ 24537.3% -3,15 f33 23 6 • 8 312 33 4,Go-%45.8 34.9 13.5 29.7 265 1 29.5«’ 7.45 1 Thomas E. Levy Groundwater ReplenishmentFacility Falm Desert Groundwater Replenishment Facility Riverside Riverside San Diego 51 j Imperial 0 4 Scale in Miles ‘7 1i<32 5239381 tN 266 I • < -20 (decrease)42.839 20” 3 3_039.6 42.3 ‘50 ' *483.18.7 "33.9 4 ,2. 45 5 432- •■10 3 20 25.5 38.625 316 .22297 J “o 739 17 8 •HI '5088 .521 .20-7--=.32.5 22-38′8 N 074 157 729,437.38.8 "42 '27 !70 960.6% 35.8 5 7,12 943 2 42 0 40433.5 16.747018 Facility 69.2 16.2 35.17.1 * 67.2.$12s16 8 69.2 690 5.• V 0 69.4 70.4 4 •70 5 60 $18.4 3855‘ Whitewater River GroundwaterReplenishment Facility 75459 48.3. 47 • '-IS’ 18351 2. 202 4 323 :Thomas E. Levy ofGroundwater A ? Replenishment-iez,25 4523/2572 327,765s*u0l“29/20.2138 3Awsnsh7 X $2.,, 247. 69.162,7 62.97eje 970.999.2 709 January 2024• Indio Subbasin• Well Location (14-Year Change) A Groundwater Replenishment Facility C_____ I California County 1..I Water Level Data Not Available------Garnet Hill Fault Trace TODDE GROUNDWATER Figure 7-5 Fourteen-Year Change in Groundwater Elevation (WY 2008-09 - WY 2022-23) • 26 7 10.3.o26421.2 • 222 J%t 223 206 25 1 18 621 1 266 21.7 9. • 222 237 2©22510 2 19 7,251204 o22227 5 22224 ?16 1 279 /:2552092 .23 262 336 16 7233 12.4* 19.518 7 8 2023 16 4O 26321 9 20 ‘o 32.9 3220 20 8 29 28 2 21 3 20 1 24 5.'18.8 19 5 , •23.8 •14.4 >218 • 26 9 • 10 26 7 18 2 23 7 193 •33,2 22 2 23 3 13.9 • 268 •24 1 Palm Desert GroundwaterReplenishment r Facility 16.6 • 21.1 ’ 18 22.9 *26 125.7 22 4 337 □□ □ □ □ □ □ □ □ □ □ 20 Figure 3-5: Water Level Monitoring Wells in the Mission Creek Subbasin Source: Mission Creek Annual Report for Water Year 2022-2023 Figure 3-5 shows the historical annual change in groundwater storage from 1978 through WY 2022-2023 in the Mission Creek Subbasin. The figure also shows annual inflows, outflows, groundwater production, and 10-year and 20-year running-average change in groundwater storage. During periods of high artificial recharge, the change in storage tends to be positive. In dry years or periods of high groundwater pumping, the change in storage can be negative. As shown in Figure 3-5, after a period of decline, starting in 2004 both the 10-year and 20-year running-average change in groundwater storage have shown positive trends. Annual inflows to the Mission Creek Subbasin are highly variable with years of high inflows corresponding to years when SWP delivery volumes were greater. The 20-year running-average change in storage shows that the Mission Creek Subbasin has been in balance since 2012. 36 DOI23N02 -/X.I/ "iiHHSijtiiiiSiiiiiS!Anunnnnsganagaannnnann “Asxannsuaangananaamn“nnunannnummanzanaannaq 17JO1 04P01 5.2 AnAauARnnnanaannzanan“Ansaannaganaqazazzazaa 15R01( I■u Ennnnnnnaamnaqaaa "um /-4•. 5 — “axxhananunnnznannannna“Axnnannauuzaazannanann Mission Creek vnosoRC=srS#”"aRd 8-1Figure ZlGa t — I I I I I I I ____ 12C01 M) — 11L04 \ [ N 21 Figure 3-6: Historical Annual Change in Groundwater Storage in the Mission Creek Subbasin Source: Mission Creek Subbasin Annual Report for Water Year 2022-2023 Groundwater levels have increased significantly in the Mission Creek Subbasin over the past 10 years from WY 2008-2009 to WY 2022-2023 as shown in Figure 3-6. The Mission Creek Subbasin Annual Report uses 2009 water levels as a metric of sustainability because historical low groundwater levels occurred in the years around 2009 throughout most of the Mission Creek Subbasin. The Mission Creek Subbasin shows a long-term positive trend in sustainability resulting from implementation of the Mission Creek Subbasin Alternative Plan. 80,000 60,000 40,000 20,000 0 (20,000) (40,000) \ R R ••Change in Storage -------Groundwater Pumping 10-Year Average Change in Storage Total Inflow 20-Year Average Change in Storage 3 R R R8 R 8 R8 R 2 o an88CTh Year — Total Outflow 8 th a on co 88 th a on rM C R o 888 Ch cu 8& 01 8 c a c ru ru R Coachella Valley, California Date 2/29/2024By grr Project No:CM23168050V>|)Figure 7-3 Notes. Water balance accounting based on calendar year through 2016 and water year thereafter. Change in storage for WY 2022-2023 was 341 acre-feet and is nearly indistinguishable from the zero baseline at the scale of the plot. HISTORICAL ANNUAL CHANGE IN GROUNDWATER STORAGE Mission Creek Subbasin Annual Report Water Year 2022-2023 Ac r e - F e e t 22 Figure 3-7: Change in Groundwater Elevation from Water Year 2008-2009 through Water Year 2022-2023 in the Mission Creek Subbasin Source: Mission Creek Subbasin Annual Report for Water Year 2022-2023 3.2 Imported Water CVWD has two sources of imported water available: Colorado River water delivered via the Coachella Canal and SWP water exchanged for Colorado River water delivered through the Colorado River Aqueduct. These imported water sources are used to recharge the groundwater basin and as an alternative source to meet non-potable demands from irrigation of agriculture, golf, and urban uses that would have otherwise been met by pumping groundwater. In the future, if urban demand significantly increases relative to non-potable uses, Colorado River water may be treated and delivered directly to customers through CVWD’s potable water distribution system. 3.2.1 Colorado River Water Colorado River water has been a significant water supply source for the Indio Subbasin since the Coachella Canal was completed in 1949. CVWD is the only agency in the Indio Subbasin that receives Colorado River water allocations. The Colorado River is managed and operated in accordance with the Law of the River, a collection of interstate compacts, federal and state legislation, various agreements and contracts, an international treaty, a U.S. Supreme Court decree, and federal administrative actions that govern the rights to use Colorado River water within the seven Colorado River Basin states. The 1922 Colorado River Compact apportioned the 28JO1 21H01 23NO2 36D01 36K01 1 I A1++£ 800 ' I 3 + 3J #£RR#288882228884824 1AAA1A#AAAA#ANNNNA 8888N8888 242828284887 ---------02SD4E28/0015 ------WY 2008-2009 — wy 2022 20231-----------------02504E21H0015 -----------02SD4E2 3N0025 ----WY 2008 2009 — WY 2022 2023 ---------02S04E36D0015 ----WY 2008 2009 ---------WY 2022 2023 2)—— 17J01Mission Creek Groundwater ? — 900Replenishment Facility04P01 + +I 1-tIII Desert Hot Spring II 888888888488888888825 #888888288882888284877 Gi D---------03S04E04P001S -----WY 2008-2009 -------WY 2022 2023 15R01 g 900I l i + •M. (___s. । ! ■8888888888B1sr11L0412C01\II5 sso )II !/f I 8888888888888888888833 —03S04E12C0015 — WY 2008 2009 — wY2--------- 03S04E111004S --------WY 2008 2009 --------wr 2022 2023 A Notes >15 to 20 foot increase 0to10 foot decrease Monitored Well >10 to 15 foot increase >10 to 20 foot decrease Coachella Valley Water District - Key Well Low 1 ing sediments/bedrock 3. Grou in feet above North American V)7-5------ Highway,Toad ---------- Change in average water level (feet) g + + + >5 to 10 foot increase 1 > 20 foot decrease 0to5 foot increase y y + 292599 S88888 8353g: 88888 2 |— + — WY2008 2009 — WY 2022 2023 Mission Springs Water District - Key Well Desert Water Agency - Key Well Other-Non Key Well Explanation Groundwater Rep s 900 — Vertical Datum (NAVD88). 4.NA= Water level unavailable in Water Year 2009. I a ----- Change in average water level (feet) r 8 sso | XX, i Mission Creek Subbasin | _ • Water level data boundary line .:2:/ $ oces—2% 20. --------- 03S05E17)0015 ---- WY 2000 2009 -------- WY 2022 2023 ---------- Water Level hydrograph for well indicated ........ Water year (WY) 2022-2023 ......... Water year (WY) 2008-2009 * Water level data not available CHANGE IN GROUNDWATER STORAGE WY 2008-2009 TO WY 2022-2023 Mission Creek Subbasin Annual Report Water Year 2022-2023Coachella Valley, CaliforniaBy: MWW Date: 2/28/2024 Project No : CM23168050 — — •X S ---------03SOSE1SR0O1S ----WY 2008 2009 ------------ -------------------------------------WY 2022 2023 fi ---------02S04536K0015 ----WY 2008 2009 ---------WY 2022 2023 +t ’X 5 70 r2 8so 1. Groundwater storage based on change in average water levels between the respective Water Years, 2. Five-foot change in water level intervals shown except near the groundwater recharge facility where ten-foot intervals are shown. s. 5 l" 23 waters of the Colorado River Basin between the Upper Colorado River Basin (i.e., Colorado, Wyoming, Utah, and New Mexico) and the Lower Basin (i.e., Nevada, Arizona, and California). The 1922 Colorado River Compact allocates 15 million AFY of Colorado River water as follows: 7.5 million AFY to the Upper Basin and 7.5 million AFY to the Lower Basin, plus up to 1 million AFY of surplus supplies. The Lower Basin’s water was further apportioned among the three Lower Basin states by the 1928 Boulder Canyon Project Act and the 1931 Boulder Canyon Project Agreement, typically called the 1931 Seven Party Agreement, which allocates California’s apportionment of Colorado River water among Palo Verde Irrigation District, Imperial Irrigation District (IID), CVWD, Metropolitan Water District of Southern California (MWD), City of Los Angeles, City of San Diego, and County of San Diego. The 1964 U.S. Supreme Court decree in Arizona v. California established Arizona’s basic annual apportionment at 2.8 million AFY, California’s at 4.4 million AFY, and Nevada’s at 0.3 million AFY. Mexico is entitled to 1.5 million AFY of the Colorado River under the 1944 United States-Mexico Treaty for Utilization of Waters of the Colorado and Tijuana Rivers and of the Rio Grande. However, this treaty did not specify a required quality for water entering Mexico. In 1973, the United States and Mexico signed Minute No. 242 of the International Boundary and Water Commission requiring certain water quality standards for water entering Mexico. California’s Colorado River supply is protected by the 1968 Colorado River Basin Project Act, which provides that in years of insufficient supply on the main stem of the Colorado River, supplies to the Central Arizona Project shall be reduced to zero before California will be reduced below 4.4 million AF in any year. This assures full supplies to the Coachella Valley, except in periods of extreme drought. The Coachella Canal is a branch of the All-American Canal that brings Colorado River water into the Imperial and Coachella Valleys. Under the 1931 Seven Party Agreement, CVWD receives 330,000 AFY of Priority 3A Colorado River water diverted from the All-American Canal at the Imperial Dam. The Coachella Canal originates at Drop 1 on the All-American Canal and extends approximately 123 miles, terminating in CVWD’s Lake Cahuilla. The service area for Colorado River water delivery under CVWD’s contract with the U.S. Bureau of Reclamation (USBR) is defined as Improvement District No. 1 (ID-1), which encompasses 136,400 acres covering most of the East Valley and a portion of the West Valley north of Interstate 10. Under the 1931 Seven Party Agreement, CVWD has water rights to Colorado River water as part of the first 3.85 million AFY allocated to California. CVWD is in the third priority position along with IID. In 2003, CVWD, IID, and MWD successfully negotiated the 2003 Quantification Settlement Agreement (2003 QSA), which quantifies Colorado River allocations through 2077 and supports the transfer of water between agencies. Under the 2003 QSA, CVWD has a base entitlement of 330,000 AFY. CVWD negotiated water transfer agreements with MWD and IID that increased CVWD supplies by an additional 123,000 AFY. CVWD’s net QSA supply will increase to 424,000 AFY by 2026 and remain at that level until 2047, decreasing to 421,000 AFY until 2077, when the agreement terminates. As of 2021, CVWD’s available Colorado River water diversions at Imperial Dam under the QSA were 399,000 AFY. This includes the base entitlement of 330,000 AFY, the MWD/IID Transfer of 20,000 AFY, IID/CVWD First Transfer of 50,000 AFY, and IID/CVWD Second Transfer of 28,000 AFY. CVWD’s QSA diversions also deducts the -26,000 AFY transferred to San Diego County Water Authority (SDCWA) as part of the Coachella Canal Lining Project and the - 24 3,000 AFY transfer to Indian Present Perfected Rights. Additionally, under the 2003 QSA, MWD transferred 35,000 AFY of its State Water Project (SWP) Table A Amount to CVWD. This SWP water is exchanged for Colorado River water and can be delivered at Imperial Dam for delivery via the Coachella Canal to the eastern portion of the Indio Subbasin or at Lake Havasu for delivery via the Colorado River Aqueduct to the western portion of the Indio Subbasin at the Whitewater River Groundwater Replenishment Facility (WWR-GRF). The 2019 Second Amendment guaranteed delivery of the 35,000 AFY from 2019 to 2026, for a total of 280,000 AFY of water to the WWR-GRF during that timeframe. MWD can deliver the water through CVWD’s Whitewater Service Connections (for recharge at WWR-GRF) or via the Advance Delivery account. The MWD/IID Transfer originated in a 1989 agreement with MWD to receive 20,000 AF of its Colorado River supply. The 2019 Amended and Restated Agreement for Exchange and Advance Delivery of Water defined the exchange and delivery terms between MWD, CVWD, and DWA. The 2019 Second Amendment to Delivery and Exchange Agreement reduced CVWD’s annual delivery of the MWD/IID Transfer to 15,000 AFY, for a total of 105,000 AF, if taken at the Whitewater Service Connections (for recharge at WWR-GRF) between 2020 and 2026. For those seven years, MWD keeps the remaining 5,000 AFY, after which CVWD’s allocation increases back up to 20,000 AFY. CVWD’s total allocations under the QSA, including MWD’s transfer of 35,000 AFY and the MWD/IID Transfer, will increase from 424,000 AFY in 2020 to 459,000 AFY by 2026 and remain at that level for the remainder of the 75-year term of the QSA. Table 3-3 lists total Colorado River entitlements under existing agreements. Table 3-3: CVWD Colorado River Entitlements (AFY) Source: 2022 Alternative Plan Update for the Indio Subbasin 1 The Second IID/CVWD Transfer began in 2018 with 13,000 AF of water. This amount increases annually by 5,000 AFY for a total of 53,000 AFY in 2026. 2 The 35,000 AFY MWD/CVWD SWP Transfer may be delivered at either Imperial Dam or Whitewater River and is not subject to SWP or Colorado River reliability. 3 Accounts for -5,000 AFY reduction in MWD/IID Approval Agreement deliveries from 2020-2026 per the 2019 Amendments with MWD. The Colorado River deliveries to CVWD at the Imperial Dam/Coachella Canal from 2018 through 2023 are shown in Table 3-4. Diversion 2020 2025 2030 2035 2040 2045 QSA Diversions 394,000 419,000 424,000 424,000 424,000 424,000 Total Diversions 429,000 454,000 459,000 459,000 459,000 459,000 Total Available Deliveries 402,800 426,300 436,050 436,050 436,050 436,050 25 Table 3-4: Colorado River Deliveries to CVWD at the Imperial Dam/Coachella Canal Imperial Dam/Coachella Canal 338,035 343,971 350,618 351,904 330,387 286,506 Source: U.S. Bureau of Reclamation, Lower Colorado Region, Colorado River Accounting and Water Use Reports for Arizona, California, and Nevada. 1 15,000 AFY of 1988 MWD/IID Approval Agreement water was delivered at WWR-GRF from 2020 to 2023. CVWD’s recharge volumes of Colorado River water from 2018 through 2023 are shown in Table 3-5. Table 3-5: CVWD Groundwater Recharge of Colorado River Water Thomas E. Levy GRF 33,348 36,143 37,536 37,971 27,993 2,076 Palm Desert GRF 0 7,757 9,700 10,633 10,949 11,179 Source: 2024-2025 CVWD Annual Engineer’s Reports on Water Supply and Replenishment Assessment 3.2.2 State Water Project The SWP is managed by DWR and includes 705 miles of aqueduct and conveyance facilities extending from Lake Oroville in Northern California to Lake Perris in Southern California. The SWP has contracts to deliver 4.172 million AFY to the State Water Contractors. The State Water Contractors consist of 29 public entities with long-term contracts with DWR for all, or a portion of, their water supply needs. In 1962 and 1963, DWA and CVWD, respectively, entered contracts with the State of California for a total of 61,200 AFY of SWP water. SWP water has been an important component of the region’s water supply mix since CVWD and DWA began receiving and recharging SWP exchange water at the WWR-GRF. Starting in 1973, CVWD and DWA began exchanging their SWP water with MWD for Colorado River water delivered via MWD’s Colorado River Aqueduct. Because CVWD and DWA do not have a physical connection to SWP conveyance facilities, MWD takes delivery of CVWD’s and DWA’s SWP water, and in exchange, delivers an equal amount of Colorado River water to the Whitewater Service Connections (for recharge at WWR-GRF and Mission Creek Groundwater Replenishment Facility). The exchange agreement was most recently re-established in the 2019 Amended and Restated Agreement for Exchange and Advance Delivery of Water. Each SWP contract contains a “Table A” exhibit that defines the maximum annual amount of water each contractor can receive excluding certain interruptible deliveries. DWR uses Table A amounts to allocate available SWP supplies and some SWP project costs among the contractors. Each year, DWR determines the amount of water available for delivery to SWP contractors based on hydrology, reservoir storage, the requirements of water rights licenses and permits, water quality, and environmental requirements for protected species in the Sacramento-San Joaquin River Delta (Delta). The available supply is then allocated according to each SWP contractor’s Table A amount. 26 CVWD’s and DWA’s collective increments of Table A water are listed in Table 3-6. Original Table A SWP water allocations for CVWD and DWA were 23,100 AFY and 38,100 AFY, respectively, for a combined amount of 61,200 AFY. CVWD and DWA obtained a combined 100,000 AFY transfer from MWD under the 2003 Exchange Agreement. In 2004, CVWD purchased an additional 9,900 AFY of SWP Table A water from the Tulare Lake Basin Water Storage District (Tulare Lake Basin) in Kings County. In 2007, CVWD and DWA made a second purchase of Table A SWP water from Tulare Lake Basin totaling 7,000 AFY. In 2007, CVWD and DWA also completed the transfer of 16,000 AFY of Table A Amounts from the Berrenda Mesa Water District in Kern County. These latter two transfers became effective in January 2010. With these additional transfers, the total SWP Table A Amount for CVWD and DWA is 194,100 AFY. Table 3-7 shows the percent allocation of SWP Table A allocations from 2018 through 2022. Table 3-8 shows the recharge of SWP Exchange Water from 2018 through 2023. Table 3-6: State Water Project Table A Allocations Original SWP Table A (AFY) Basin 2004 Transfer Water District 2003 Transfer Basin 2007 Transfer Mesa 2007 Transfer Total (AFY) CVWD 23,100 9,900 88,100 5,250 12,000 138,350 DWA 38,100 0 11,900 1,750 4,000 55,750 Source: 2020 Coachella Valley Regional Urban Water Management Plan Table 3-7: State Water Project Table A Percent Allocations Table A Allocation 35% 75% 20% 5% 5% 100% Source: CA Department of Water Resources Historical Table A Allocations for Years 1996-2024 Table 3-8: CVWD and DWA Groundwater Recharge Whitewater River GRF 129,725 235,600 126,4871 15,0061 15,0111 219,7451 Mission Creek GRF 2,027 3,688 1,768 0 0 5,275 Source: CVWD 2024-2025 Annual Engineer’s Reports on Water Supply and Replenishment Assessment 1 Between 2020 and 2023, 15,000 AFY of 1988 MWD/IID Approval Agreement water was delivered at Whitewater River GRF. 3.2.3 Other SWP Water There are other types of SWP water that can be purchased, such as individual water purchase opportunities and transfers/exchanges. These may be conveyed to CVWD and DWA as available, but no commitments exist. In 2008, CVWD and DWA entered into separate agreements with DWR for the purchase and conveyance of supplemental SWP water under the Yuba River Accord Dry Year Water Purchase 27 Program (Yuba Accord). This program provides dry year supplies through a water purchase agreement between DWR and Yuba County Water Agency, which settled long-standing operational and environmental issues over instream flow requirements for the lower Yuba River. The amount of water available for purchase varies annually and is allocated among participating SWP contractors based on their Table A amounts. CVWD and DWA may purchase up to 1.72 percent and 0.69 percent, respectively, of available Yuba Accord water, in years it is made available. Yuba Accord deliveries have varied from zero in multiple years to a total of 2,664 AFY to CVWD and DWA in 2013. Article 21 water (described in Article 21 of the SWP water contracts), “Interruptible Water,” is water that State Water Contractors may receive on a short-term basis in addition to their Table A water if they request it in years when it is available. Article 21 water is used by many contractors to help meet demands in low allocation years. Article 21 water is not available every year, amounts vary when it is available, and is proportionately allocated among participating Contractors. The availability and delivery of Article 21 water cannot interfere with normal SWP operations and cannot be carried over for delivery in a subsequent year. 3.3 Surface Water CVWD does not currently use or intend to use any local surface water as part of its urban potable water supply. Local runoff is captured and used for groundwater recharge. 3.3.1 River/Stream Diversion Surface water supplies come from several local rivers and streams including the Whitewater River, Snow Creek, Falls Creek, and Chino Creek, as well as a number of smaller creeks and washes. Because surface water supplies are affected by variations in annual precipitation, the annual supply is highly variable. The 50-year hydrologic period from 1970 to 2019 had an annual average watershed runoff of 52,506 AFY, with approximately 43,300 AFY in natural infiltration. Runoff during the 25-year period from 1995 to 2019 was below average, with 39,196 AFY in watershed runoff and 29,200 AFY in natural infiltration. CVWD does not currently use or intend to use any local surface water as part of its urban potable water supply. Local runoff is captured or infiltrates naturally for groundwater recharge. 3.3.2 Stormwater Capture The Coachella Valley drainage area is approximately 65 percent mountainous and 35 percent typical desert valley with alluvial fan topography buffering the valley floor from the steep mountain slopes. The mean annual precipitation ranges from 30 inches or more in the San Bernardino Mountains to less than 3 inches at the Salton Sea. Three types of storms produce precipitation in the drainage area: general winter storms, general thunderstorms, and local thunderstorms. Longer duration, lower intensity rainfall events tend to have higher recharge rates, but runoff from flash flooding can result from all three types of storms. Otherwise, there is little to no flow in most of the streams in the drainage area. 28 Significant amounts of local runoff are currently captured at the Whitewater River GRF and in the debris basins and unlined channels of the western Coachella Valley. Additional stormwater will be captured when the Thousand Palms Flood Control Project is completed and when flood control is constructed in the Oasis area. However, limited data exists to estimate the amount of additional stormwater that could be captured by new facilities in the Coachella Valley. Nonetheless, large-scale stormwater capture is not expected to yield sufficient water to be worth the investment as a single purpose project. Small-scale stormwater retention systems located in areas of suitable geology to allow percolation could capture small intensity storms as well as street runoff. The potential yield of these systems is not known at this time, but stormwater capture should be considered in conjunction with projects that construct stormwater and flood control facilities. 3.4 Wastewater and Recycled Water Wastewater that has been highly treated and disinfected can be reused for landscape irrigation and other purposes. Recycled wastewater has historically been used for irrigation of golf courses and municipal landscaping in the Coachella Valley since as early as the 1960s. As growth occurs in the eastern Coachella Valley, the supply of recycled water is expected to increase, creating an additional opportunity to maximize local water supply. CVWD operates five water reclamation plants (WRPs), two of them (WRP-7 and WRP-10) generate recycled water for irrigation of golf courses and large landscaped areas. WRP-4 became operational in 1986 and serves the communities from La Quinta to Mecca. WRP-4 effluent is not currently recycled; however, it will be in the future when the demand for recycled water is developed and tertiary treatment is constructed. The other two WRPs serve communities near the Salton Sea. A sixth WRP (WRP-9) was decommissioned in July 2015. The wastewater treated by CVWD from 2018 through 2023 is shown in Table 3-9. Table 3-10 shows the recycled water produced by CVWD from 2018 through 2023. CVWD will continue to expand its recycled water program by connecting additional recycled water customers to meet the non-potable water demands in the western and eastern portions of the Coachella Valley. Table 3-9: Wastewater Treated by CVWD WRP-1 19 16 18 24 22 21 WRP-2 12 16 13 15 16 17 WRP-4 5,900 6,065 6,353 6,452 6,440 6,117 WRP-7 3,275 3,246 3,236 3,287 3,375 3,420 WRP-10 10,124 9,663 9,238 8,980 9,235 9,309 29 Table 3-10: Recycled Water Produced by CVWD 3.5 Conservation Water conservation, and the reduced groundwater production associated with water conservation, benefits the groundwater basin and is an important element of the Alternative Plans and the 2020 Regional UWMP. CVWD has utilized several programs to ensure water conservation within its service area. CVWD has implemented allocation-based conservation water pricing (i.e. tiered rates) to prevent water waste or unreasonable use of water. In addition, CVWD’s indoor rebate programs are designed to assist homeowners and commercial customers reduce water usage by upgrading toilets, replacing inefficient devices, and installing new technology to improve efficiency. CVWD also has outdoor rebate programs that are designed to assist homeowners, homeowners associations, and commercial customers reduce outdoor water usage by converting turf to desert landscaping, installing smart irrigation controllers, and improving the efficiency of irrigation systems. CVWD offers seminars, workshops, and classes to help educate the public regarding the need for water conservation and the conservation programs that are available. 3.6 Landscape Ordinance CVWD Landscape Ordinance 1302.5 requires a series of reduction methods in conjunction with the Model Water Efficient Landscape Ordinance (MWELO) set forth by the Department of Water Resources. Reduction methods include requirements that new developments install weather- based irrigation controllers that automatically adjust watering. Additional requirements include setbacks of spray emitters from impervious surfaces, as well as use of porous rock and gravel buffers between grass and curbs to eliminate run-off onto streets. With the exception of turf, all landscaping including groundcover and shrubbery must be irrigated with a drip system. Also, the maximum water allowance for landscaped areas through the CVWD service area has been reduced. This reduction goal requires that developers maximize the use of native and other drought-tolerant landscape materials and minimize use of more water-intensive landscape features, including turf and fountains. Projects that will be served by CVWD’s Domestic Water System are subject to the current CVWD Landscape Ordinance or any future updates in effect at the time that landscape plans are approved. Recycled Water (AF) 2018 2019 2020 2021 2022 2023 WRP-7 2,246 1,657 1,936 2,136 2,170 2,167 WRP-10 7,857 7,100 7,521 7,285 7,371 7,111 30 3.7 Other Demand Management Regulations California recognizes the need for regulations that encourage efficient water management practices and has developed policies that emphasize water use efficiency and conservation. CVWD will continue to foster efficient water use by engaging customers and supporting programs that focus on water conservation to meet the requirements of these regulations. 3.7.1 Making Conservation A California Way of Life Making Conservation a California Way of Life aims to increase water efficiency across the State. Two bills (Senate Bill 606 and Assembly Bill 1668) were passed in 2018 directing the Department of Water Resources and the State Water Resources Control Board (State Water Board) to develop regulations for the next generation of California water savings requirements. On July 3, 2024, the State Water Board adopted the Making Conservation a California Way of Life regulation. The adopted regulation holds urban retail water suppliers responsible for meeting individualized water use objectives calculated for each service area. The water use objective (or water budget) is calculated from the five components shown below in Figure 3-7. Individual residents will not be regulated — only urban water suppliers will be responsible for meeting the water use objective for the service area. Figure 3-7: Components of Water Use Objective Calculation Indoor Residential Objective The indoor residential standard applies to both existing and new construction of single family and multi-family housing units within an urban water supplier’s service area. The indoor residential standard is based on a gallons per capita per day (gpcd) metric that will decrease over time. The state will not enforce indoor budgets for individual residential parcels. Suppliers multiply population served by the indoor residential standard by 365 days to calculate the annual indoor water use budget for the service area. The indoor residential standard will decrease from 55 gpcd to 42 gpcd by 2030 to as shown in Table 3-11. AM I' ss- e++Tae Water LossResidential Outdoor CII-DIM Outdoor Residential Indoor Ml If applicable: Variances, Temporary Provisions & Bonuses 31 Table 3-11: Indoor Residential Water Use Standard Year Standard Outdoor Residential Objective In addition to the indoor residential water use objective, outdoor residential water use objectives were also adopted through the regulation. The outdoor residential objective applies to both existing and new construction of single family and multiple family housing units within an urban water supplier’s service area. The state provided each supplier with residential landscape area (based on aerial imagery). Total residential landscape area (in square feet) will be used to calculate an individualized residential landscape budget based on local conditions like evapotranspiration (Eto) and precipitation. The State will not enforce outdoor water budgets for individual residential parcels. Some special landscaped areas (SLAs) are assigned a higher landscape efficiency factor of 1.0 allowing a higher water budget for these irrigated areas. SLAs include areas dedicated to edible plants, serving a recreational function, irrigated with recycled water, and water features that use recycled water. Commercial Industrial Institutional with Dedicated Irrigation Meters (CII-DIM) The Making Conservation a California Way of Life regulation also sets outdoor water budgets for commercial, industrial, and institutional outdoor landscapes with dedicated irrigation meters (CII-DIM). For CII-DIM landscape irrigation, the total irrigated area will be used to calculate individualized outdoor water budgets based on local conditions like Eto and precipitation. Urban water suppliers will make annual progress in measuring the irrigated area of CII landscapes with DIMs, with all subject landscapes being measured by 2028. The State will not enforce outdoor water budgets for individual CII-DIM customers. Similar to the outdoor residential objective, the regulation identified SLAs for CII-DIMs which include areas dedicated to edible plants, serving a recreational function, irrigated with recycled water, and water features that use recycled water, as well as bioengineered slopes; ponds for recreation or for sustaining wildlife; public swimming pools; existing plant collections, botanical gardens, and arboretums; and cemeteries built before 2015. 3.7.2 Non-Functional Turf Ban In October 2023, California passed AB 1572 (Friedman), a statewide legislation prohibiting the use of potable water to irrigate non-functional turf on commercial, industrial, and institutional properties with potable water. Non-functional turf means any turf areas that are decorative and have no other functions, such as recreation. The prohibition includes turf located within street rights-of-way, including road medians, and parking lots. The legislation exempts 32 functional turf, such as sports fields, picnic areas, and cemeteries, or areas irrigated with recycled water. The legislation does not apply to residential turf but does prohibit the use of potable water to irrigate common areas within homeowners’ associations. The ban takes effect as of the following dates: 1) 2027 – Properties owned by local governments 2) 2028 – Commercial and industrial properties 3) 2029 – Common areas of homeowners’ associations 4) 2031 – Properties owned by local governments in disadvantaged communities or when state funding for turf replacement is available 3.8 Water Shortage Contingency Planning Based on the experiences from the 2013-2015 drought, CVWD’s domestic Water Shortage Contingency Plan provides the shortage levels summarized in Table 3-11. The trigger levels used to determine the water shortage level depend on the local water situation or applicable State mandates. CVWD has a diverse mix of water supplies and benefits from a large groundwater basin providing storage. CVWD’s groundwater replenishment program replenishes the basin to increase groundwater storage during wet years and that supply is available for use during dry years. Table 3-12: Urban Water Shortage Contingency Plan Shortage Levels 1 Up to 10% Normal water supplies 2 Up to 20% Slightly limited water supplies 3 Up to 30% Moderately limited water supplies 4 Up to 40% Limited water supplies 5 Up to 50% Significantly limited water supplies 6 Up to 60% Severe shortage or catastrophic incident Source: 2020 CVWD Water Shortage Contingency Plan 33 4 Public Water System – Projected Supply and Demand Coachella Valley Water District (CVWD) projects that a majority of its urban potable water uses will continue to be supplied from local groundwater. In addition to groundwater, CVWD has secured imported water supplies from the State Water Project (SWP) and the Colorado River, and recycled water from water reclamation plants. These imported and recycled water supplies are used to meet CVWD’s non-potable water demands and to replenish the groundwater basin. 4.1 Projected Urban Demand and Supply The following tables from the 2020 Regional Urban Water Management Plan (Regional UWMP) provide the CVWD’s projected water supplies and demands. Potable water demand projections for the CVWD service area are summarized in Table 4-1. Table 4-1: CVWD Projected Urban Retail Potable Demands Single Family 60,142 63,824 67,331 69,816 71,695 Multi-Family 6,873 7,245 7,742 8,267 9,045 CII 7,060 7,244 7,438 7,709 7,985 Landscape 34,193 36,205 38,226 39,865 41,516 Other 1,457 1,563 1,670 1,755 1,840 Losses 13,736 14,501 15,222 15,670 16,085 Source: 2020 Coachella Valley Regional Urban Water Management Plan A summary of existing and planned urban water supply volumes by source are presented in Table 4-2. It should be noted that the supplies and demands presented in the tables below include recycled water delivered to CVWD’s non-potable customers based on the DWR standardized tables and 2020 UWMP Guidebook. DWR requires the supply reliability table to include both potable and recycled water, however, CVWD’s recycled water is not a potable water supply and is not delivered to CVWD’s potable water customers. Instead, recycled water is used to offset the groundwater pumping of private well owners (mainly for golf course and landscape irrigation) to eliminate overdraft. These projections were based on 2010 U.S. Census Data, DWR’s Population Tool, the Southern California Association of Governments’ (SCAG) 2020 Connect SoCal Regional Transportation Plan, and seasonal occupancy data from the Greater Palm Springs Convention and Visitors Bureau. 34 Table 4-2: CVWD Projected Urban Water Supplies 123,461 130,582 137,629 143,081 148,166 Recycled Water Total 137,061 144,982 152,729 158,981 164,966 Source: 2020 Coachella Valley Regional Urban Water Management Plan 4.2 Normal, Single-Dry, Multiple-Dry Year Comparison The following tables from the 2020 Regional UWMP provide CVWD’s projected water supplies and demands in a normal year, single-dry year, and multiple-dry years. During normal years, CVWD will be able to meet current and future urban water demand needs projected in the 2020 Regional UWMP through groundwater pumping and recycled water as shown in Table 4-3. Table 4-3: Normal Year Supply and Demand Comparison Groundwater 123,461 130,582 137,629 143,081 148,166 Recycled Water 13,600 14,400 15,100 15,900 16,800 Potable Water Demand 123,461 130,582 137,629 143,081 148,166 Recycled Water Demand 13,600 14,400 15,100 15,900 16,800 Source: 2020 Regional Urban Water Management Plan Note: CVWD and the other Regional UWMP agencies collaborate on groundwater management plans for long-term sustainability. During a normal year, single-dry year, or five-dry year period, the agencies could produce additional groundwater if demands exceeded the estimates shown here. During single-dry years, CVWD will be able to meet current and future urban water demand needs through groundwater pumping and recycled water as shown in Table 4-4. Water supplies during the single-dry year are 100 percent reliable. CVWD’s groundwater replenishment program replenishes the basin to increase groundwater storage during wet years and that supply is available for use during dry years. Thus, the supply and demand comparison for the single-dry year is the same as the normal year. 35 Table 4-4: Single-Dry Year Supply and Demand Comparison Groundwater 123,461 130,582 137,629 143,081 148,166 Recycled Water 13,600 14,400 15,100 15,900 16,800 Potable Water Demand 123,461 130,582 137,629 143,081 148,166 Recycled Water Demand 13,600 14,400 15,100 15,900 16,800 Source: 2020 Regional Urban Water Management Plan Note: CVWD and the other Regional UWMP agencies collaborate on groundwater management plans for long-term sustainability. During a normal year, single-dry year, or five-dry year period, the agencies could produce additional groundwater if demands exceeded the estimates shown here. During multiple-dry years, CVWD will be able to meet current and future urban water demand needs through groundwater pumping and recycled water as shown in Table 4-5. Similar to the single-dry year, the multiple-dry year water supply reliability is 100 percent. Thus, the supply and demand comparison for the multiple-dry years is the same as the normal year. CVWD and the other Regional UWMP agencies collaborate on groundwater management plans for long-term sustainability. During a normal year, single-dry year, or five-dry year period, the agencies could produce additional groundwater if demands exceeded the estimates shown here. 36 Table 4-5: Multiple-Dry Years Supply and Demand Comparison First Year Groundwater 123,461 130,582 137,629 143,081 148,166 Recycled Water 13,600 14,400 15,100 15,900 16,800 Potable Water Demand 123,461 130,582 137,629 143,081 148,166 Recycled Water Demand 13,600 14,400 15,100 15,900 16,800 Second Year Groundwater 123,461 130,582 137,629 143,081 148,166 Recycled Water 13,600 14,400 15,100 15,900 16,800 Potable Water Demand 123,461 130,582 137,629 143,081 148,166 Recycled Water Demand 13,600 14,400 15,100 15,900 16,800 Third Year Groundwater 123,461 130,582 137,629 143,081 148,166 Recycled Water 13,600 14,400 15,100 15,900 16,800 Potable Water Demand 123,461 130,582 137,629 143,081 148,166 Recycled Water Demand 13,600 14,400 15,100 15,900 16,800 Fourth Year Groundwater 123,461 130,582 137,629 143,081 148,166 Recycled Water 13,600 14,400 15,100 15,900 16,800 Potable Water Demand 123,461 130,582 137,629 143,081 148,166 Recycled Water Demand 13,600 14,400 15,100 15,900 16,800 Fifth Year Groundwater 123,461 130,582 137,629 143,081 148,166 Recycled Water 13,600 14,400 15,100 15,900 16,800 Potable Water Demand 123,461 130,582 137,629 143,081 148,166 Recycled Water Demand 13,600 14,400 15,100 15,900 16,800 Source: 2020 Regional Urban Water Management Plan Note: CVWD and the other Regional UWMP agencies collaborate on groundwater management plans for long-term sustainability. During a normal year, single-dry year, or five-dry year period, the agencies could produce additional groundwater if demands exceeded the estimates shown here. CVWD’s total current urban water demand was 102,339 acre-feet (AF) for 2023, including 93,061 AF of groundwater and 9,278 AF of recycled water. 37 5 Project Description Catavina (Project) is located in the central portion of the Coachella Valley within the City of Palm Desert, Riverside County as shown in Figure 5-1. The Project will be accessible from Portola Avenue and Frank Sinatra Drive and is bound by Frank Sinatra Drive to the north, a portion of Portola Avenue and a vacant lot to the east, residential development to the south, and residential development to the west, as shown in Figure 5-2 and Figure 5-3. The Project proposes to develop approximately 78 acres of vacant land to include 546 residential lots of varying lot sizes: Lot Program 1 contains 88 5,000 square feet lots. Lot Program 2 contains 100 4,050 square feet lots. Lot Program 3 contains 103 3,000 square feet lots, and Lot Program 4 contains 255 6-pack cluster single family detached units at varying sizes ranging from 2,120 to 2,460 square feet. In total, approximately 40 acres will be dedicated to residential lots. The Project would also include approximately 2.8 acres of retention basins, approximately 12 acres of common open space, and approximately 21 acres of roads. As shown in Figure 5-4, a recreation area would also be constructed that would include community buildings, a community pool and spa, sport courts, and a dog park (acreage included in the 12-acre common open space). 38 Figure 5-1: Project Regional Location Map 1 ( f h ) . wh‘3 i NA l y i (‘x || % T 7 CATHEDRAL^ — L7a *. 155 dN 210 4) 11 «1 SITE PALM INDIAN • Xy %1WELLSs CI- y. — — M a □"I(712 r,*T)EAI ( " .)|Yhyy f ays "As ‘eh)r.S0‘$-094/Ve 5 i/7 Ya________(_____ _____ (a AR-1ORY i PALM SPRINGS SALTON SEA "050. R. 5 J Ml. MSA CONSULTING, INC Civil Engineering • Land Surveying • Landscape Architecture Planning • Environmental Services • Dry Utility Coordination • GIS A W REGIONAL LOCATION MAP CATAVINA WATER SUPPLY ASSESSMENT Tahe yy l V s ya A- / ste .3 w LA QUINTA 0 L INSERT HOT SPRINGS f)at 5% ’ V i ♦ Av ■ TIA " ) %,) “B)t 4, Wh) s, WIUI . ag P s _______ el 1. I 2 ) y J, l k ) 9PROJECT " L \alHopur INDIAN 2 1 INDIO. |—Mr stms. 39 Figure 5-2: Project Vicinity Map RANCHO MIRAGE COUNTRY CL PALM 8 y \ HWY i | CATHEbRAL 1 "I CITY^ DR I_____I I INDIO II 1 I I I 4. I I_______ I HOVLEY LNDESERT 1 L.. 4 ‘g ... LA QUINTAI INDIAN WELLS y I g “M,,e) 3 ..J I f LEGEND I. ] PROJECT SITE CITY OF PALM DESERT BOUNDARY 7 CITY BOUNDARIES aE1ORY i 6,000_J Feet MSA CONSULTING, INC Civil Engineering • Land Surveying • Landscape Architecture Planning • Environmental Services • Dry Utility Coordination • GIS VICINITY MAPCATAVINA WATER SUPPLY ASSESSMENT0 L MO N T E R E Y PO R T O L A A V E 5 CO O K S T 40 Figure 5-3: Project Site Plan EE chirs ll ! d ERANKSINATRA /I| Imany=*= y' i," । TT ’i T 2। ..... ILAL* 2 L_- N fff -IT —T ! II+th 1 I 1 / !7 || | 2 ■1 E —mt /Jnn (-Fft +15.i" r ।" .—■—i- i T||4 l —JII ILTrTT!TlLOT PROGRAM 1 e —! U1—-E3,GWEtSeT,s5 I "i - LOTPROGRAN -alI—-5/,‘s/-27,—111 fH 'llIIm d“h I P — ! -OTT1 E .9 r]“TFE ? fca dth | uz mm I n 2.t I I 7sAA-g4t_1b It Li1 /- 1 57- 4 4114214:y _I -jan 1. f . H-2 IV /PLOT PROGRAM 3 iiW Jns292ill I=x ESMT. TO EE ouI Tt La MEC -__JI 1•l l|~’ ------."I- —I - t r: -3 Y /W rim /1 -0 nyPeV 1Tr —— — 12*£ • 5 I y, I a-r I22 1 . 7443 //75 -s CW i1 1 /7 4।"T/- J —t 5 DESERT WILLOW02GOLF RESCRI1 ; J I II—-‘175 K j)। i ‘ )-rnon.20 EEWER EEM". g t I lI -Us . 33 -poe=ES6E 1ur-fm"=|=fl=7 12/21*12 1 1 a 212 121 -eruruT -J +1 ERSECCEDCEL-1 1111471027.Aslis , AA yi J /ies 200___-----e SCAE:,1"-102 ( MSA CONSULTING, INC THERETREA AT DESERT WILLOW Civil Engineering - Land Surveying - Landscape Architecture Planning • Environmental Services - Dry Utility Coordination - GIS 5E ts =-i iL Mse — — I—LOT PROGRAM 4 :]‘ 1 1 YE2-85 2 karas e V a—lIYI3 5esai > ; —f A231—L -le.r"1+4-L- --1 _---* I _ C-EMaadd-y o-— SITE PLAN CATAVINA WATER SUPPLY ASSESSMENT mT 0UrL:, -5Y 1 K’ - “ B E fE" i ==> S h on2==, 1 2 A -6)) a -—| a tit — — 11 LLOT PROGRAM 2 — +=curc "T I1 n 1 17 J Ft s. ■I, i ! ! nC. ill : 4 —L 1.2y i wE 7 - I-M.i I W t Ehli. I f TH ——1) i : j ) 1/7 F J ] t —= ;W'i 11 JA*. 11; lsg | HI da isC 5 10 E . K. Hri =0// /r —0.7 170//2/ ■ 2 Vs oegi 55 ——--=+=?= (= *ll .1 1 Ef J % - IH | s t | : / lor AW c........ , <s -I. ".rs d E* ESMT.TOEEQUITL — — "*X fml 1— . . SPMEI » 16 —LF-EnNV (// dll1! X! — I bg 7 5) .Pasadi — — 1 100 50 41 Figure 5-4: Project Recreation Area 0PLAY LAWN % fl PLAZA 0 i DOGL7 [PARK ySa ] D. PICKLEBALL (6 COURTS) D 0 0 ARRIVAL COURT •)* CORNHOLE/ HORSESHOES LAWN BOCCEE 2 COURTS)' a SPORTS==== n SOCIAL — L PARKING THE —VENUE .1 . 0 SPLASHPADs POOL \AREA'O T------- I j~l FLEX LAWN TOT LOT BEACH ENTRY SOCIAL PLAZA/ FIRESIDE SEATING 17 _1 t 0 A $1 B.O.H VOLLEYBALL if LAPS / / SWM J RESIDENTIAL LOTS TO REMAIN AG SPA ( RECREATION AREA CATAVINAWATER SUPPLY ASSESSMENT MSA CONSULTING, INC Civil Engineering • Land Surveying • Landscape Architecture Planning - Environmental Services • Dry Utility Coordination - GIS MA M V A V A V V V V " ” 42 Table 5-1: Project Land Use Summary Planning Area Area Target Density (EDUs/Acre) Estimated Dwelling Units (EDUs) Building Area (sf) Lot Program 1 10.52 8.37 88 Lot Program 2 9.8 10.20 100 Lot Program 3 7.4 13.92 103 Lot Program 4 12.8 19.92 255 Community Buildings 0.38 16,400 Pools 0.32 Hardscapes 0.29 Common Open Space 12.2 Retention Basins 2.79 Parking Lot 0.65 Roads 20.7 43 6 Project Water Demands The Project proposes to develop approximately 78 acres of vacant land to include 546 residential lots of varying lot sizes: Lot Program 1 contains 88 5,000 square feet lots. Lot Program 2 contains 100 4,050 square feet lots. Lot Program 3 contains 103 3,000 square feet lots, and Lot Program 4 contains 255 6-pack cluster single family detached units at varying sizes ranging from 2,120 to 2,460 square feet. In total, approximately 40 acres will be dedicated to residential lots. The Project would also include approximately 2.8 acres of retention basins, approximately 12 acres of common open space, and approximately 21 acres of roads. A recreation area would also be constructed that would include community buildings, a community pool and spa, sport courts, and a dog park (acreage included in the 12-acre common open space). 6.1 Projected Indoor Residential Water Demand The projected indoor residential unit usage for this Water Supply Assessment/Water Supply Verification (WSA/WSV) is based on indoor water use performance standards as provided in the California Water Code (CWC) for residential water demand Water Code Section 10910 approved November 10, 2009, codified in CWC section 10608.20 (b)(2)(A). The projected indoor residential water demand for the Project totals 51.37 acre-feet per year (AFY) as shown in Table 6-1. SB 606 and AB 1668 established guidelines for efficient water use and a framework for the implementation and oversight of the new standards. Based on results of the Indoor Residential Water Use Study, DWR and the State Water Resources Control Board jointly recommended that the indoor residential standard remain at 55 gallons per capita per day (gpcd) through 2024 and decline to 47 gpcd in 2025 and to 42 gpcd in 2030. Table 6-1: Projected Indoor Residential Water Demand Planning Area Land Area (Acres) Dwelling Units Estimated Occupants per Home 1 per Day (gpd) per 2 gpd/EDU Water Demand (gpd) Water Demand (AFY) Lot Program 1 10.52 88 2 42 84 7,392 8.28 9.8 100 2 42 84 8,400 9.41 7.4 103 2 42 84 8,652 9.69 12.8 255 2 42 84 21,420 23.99 Total 40.52 546 45,864 51.37 1 CA Department of Finance Table 2: E-5 City/County Population and Housing Estimates, 2024 for the City of Palm Desert 2 CA Indoor Water Use Performance Standard 44 6.2 Projected Indoor Commercial and Industrial Water Demand The projected indoor commercial and industrial unit usage for this WSA/WSV are based on the American Water Works Association Research Foundations (AWWARF’s) Commercial and Industrial End Uses of Water. The projected indoor commercial and industrial water demand for the Project totals 10.36 AFY as shown in Table 6-2 below. Table 6-2: Projected Indoor Commercial and Industrial Water Demand Planning Area Indoor Area (ft2) Demand Factor 2 1 Water Demand (gpd) Water Demand (AFY) Total 16,400 9,244.93 10.36 1 AWWARF Commercial and Industrial End Uses of Water, 2000. 6.3 Projected Outdoor Irrigation Water Demand The projected outdoor irrigation water usage is based on the Maximum Applied Water Allowance (MAWA) equation from Appendix D of Coachella Valley Water District’s (CVWD’s) Landscape Ordinance No. 1302.5, which meets the water conservation goals of the California Department of Water Resources (DWR) Model Efficient Landscape Ordinance (MWELO). The projected outdoor irrigation water demand for the Project is 93.34 AFY as shown in Table 6-3 below. Table 6-3: Projected Outdoor Irrigation Water Demand Planning Area Landscaped Area (ft2) ETo (in/yr) 1 ETAF 2 Factor 2 3 Demand Demand Lot Program 1 275,000 64.22 0.45 0.62 13,499.40 15.12 Lot Program 2 256,000 64.22 0.45 0.62 12,566.71 14.08 Lot Program 3 193,500 64.22 0.45 0.62 9,498.67 10.64 Lot Program 4 335,000 64.22 0.45 0.62 16,444.72 18.42 Hardscapes 0 64.22 0.45 0.62 0.00 0.00 Common Open Space 450,000 64.22 0.45 0.62 22,089.92 24.74 95,000 64.22 0.45 0.62 4,663.43 5.22 Total 1,697,500 83,328.09 93.34 1 Reference Evapotranspiration (ETo) for ETo Zone 3 from CVWD Landscape Ordinance 1302.5, Appendix C 45 2 Evapotranspiration Adjustment Factor (ETAF) from CVWD Landscape Ordinance 1302.5, Appendix D 3 Conversion Factor from CVWD Landscape Ordinance 1302.5, Appendix D 6.4 Projected Outdoor Water Features Demand The projected outdoor recreational water usage is based on the Estimated Total Water Usage (ETWU) equation from Appendix D of CVWD’s Landscape Ordinance No. 1302.5. The projected outdoor water features demand for the Project is 1.71 AFY as shown in Table 6-4 below. Table 6-4: Projected Outdoor Recreational Water Demand Planning Area Water Feature Area (ft2) ETo (in/yr) 1 Plant Factor 2 Factor 2 3 Demand Demand Pools 14,000 64.22 1 0.62 1,527.20 1.71 1 Reference Evapotranspiration (ETo) for ETo Zone 3 from CVWD Landscape Ordinance 1302.5, Appendix C 2 Plant Factor of 1.1 for a stationary body of water, and 1.2 for a moving body of water, from CVWD Landscape Ordinance 1302.5 3 Conversion Factor from CVWD Landscape Ordinance 1302.5, Appendix D 6.5 Projected Total Water Demand The total projected water demand for the Project is 156.78 AFY, or 2.01 acre-feet per acre, as shown in Table 6-5 below. Table 6-5: Projected Total Water Demand Planning Area Land Area (Acres) Indoor Residential Demand (AFY) Commercial and Industrial Demand Outdoor Irrigation Demand (AFY) Outdoor Recreational Demand (AFY) Total Water Demand (AFY) Lot Program 1 10.52 8.28 15.12 23.40 9.80 9.41 14.08 23.49 7.40 9.69 10.64 20.33 12.80 23.99 18.42 42.41 0.38 10.36 10.36 12.20 24.74 24.74 2.79 5.22 5.22 46 Total 77.85 51.37 10.36 93.34 1.71 156.78 6.6 Projected Water Sources The source of potable water for the Project will be supplied by CVWD’s domestic system. Table 6-6: Projected Water Sources Planning Area Land Area (Acres) Indoor Residential Demand (AFY) Commercial and Industrial Outdoor Irrigation Demand (AFY) Outdoor Water Feature Demand Lot Program 1 10.52 CVWD Domestic Water System CVWD Domestic Water System Lot Program 4 12.8 Community Buildings 0.38 Domestic Water Pools 0.32 12.2 CVWD Domestic Water System 2.79 6.7 Conservation Measures The landscape for the Project would incorporate non-invasive, drought-tolerant plant materials that are climate-appropriate, water efficient, and sustainable. Landscaping for the Project shall comply with all CVWD, City, and County ordinances relating to water efficiency. The Project shall comply with CVWD Landscape Ordinance 1302.5 (referenced in Section 3.6 of this document). The Model Water Efficient Landscape Ordinance (MWELO) sets forth requirements that all new developments install weather-based irrigation controllers that automatically adjust watering, as well as setbacks of spray emitters, buffers between grass and curbs to eliminate run-off onto streets, and requirements for drip irrigation for landscaping 47 (excluding turf). The Project shall comply with MWELO and any future updates in effect at the time that landscape plans are approved. 7 Availability of Sufficient Supplies 7.1 Water Supply Assessment Based on the analysis in this Water Supply Assessment (WSA), the projected total water demand for the Catavina (Project) will be 156.78 acre-feet per year (AFY), or 2.01 acre-feet per acre. CVWD’s long-term water management planning ensures that adequate water supplies are available to meet existing and future water needs within its service area. CVWD’s 5-year average urban water demand from 2019 to 2023 was 98,058 AFY, and the projected urban water demand by 2045 is 148,166 AFY. This Project’s water demand of 156.78 AFY accounts for approximately 0.1 percent of the total planned increases by 2045 based on the current conditions as represented by the average urban water demand of 98,058 AFY from 2019 to 2023. This WSA provides an assessment of the availability of sufficient water supplies during normal, single-dry, and multiple-dry years over a 20-year projection to meet the projected demands of the Project, in addition to existing and planned future water demands of CVWD, as required by Senate Bill (SB) 610 and SB 1262. This WSA also includes identification of existing water supply entitlements, water rights, water service contracts, and agreements relevant to the identified water supply for the Project and quantities of water received in prior years pursuant to those entitlements, rights, contracts, and agreements. This WSA has been prepared in compliance with the requirements of SB 610 and SB 1262 by MSA Consulting, Inc. in consultation with CVWD and the City. This WSA does not relieve the Project from complying with all applicable state, county, city, and local ordinances or regulations including the CVWD Landscape Ordinance, and indoor water use performance standards provided in the California Water Code now or in the future. Consistent with the provisions of SB 610, neither this WSA nor its approval shall be construed to create a right or entitlement to water service or any specific level of water service, and shall not impose, expand, or limit any duty concerning the obligation of CVWD to provide certain service to its existing customers or to any future potential customers. This WSA does not constitute an agreement to provide water service to the Project, and does not entitle the Project, Project applicant, or any other person or entity to any right, priority, or allocation in any supply, capacity, or facility. To receive water service, the Project will be subject to an agreement with CVWD, together with any and all applicable fees, charges, plans and specifications, conditions, and any and all other applicable CVWD requirements in place and as amended from time to time. Nor does anything in this WSA prevent or otherwise interfere with CVWD’s discretionary authority to declare a water shortage emergency in accordance with the Water Code. 48 This WSA will be reviewed every five years, or in the event that the water planning assumptions have changed, until the Project begins construction to ensure it remains accurate and no significant changes to either the Project or available water supply has occurred. The Project applicant shall notify CVWD when construction begins. 7.2 Requirement for Written Verification of Water Supply Availability Government Code §66473.7 requires that a Written Verification of Water Supply (WV) be prepared in connection with the approval of a development agreement or tentative map that includes a subdivision. A subdivision is defined as a proposed residential development of more than 500 units, except that for a water agency with fewer than 5,000 service connections, a subdivision includes a residential development project that would account for an increase of 10 percent or more in the number of the agency’s existing service connections. This WSA is not a WV. If the City determines that the Project or any planning area meets the definition of a subdivision and therefore requires preparation of a WV, the City must request a WV prepared by CVWD in compliance with the requirements of SB 221. This WSA may be used to support the WV. Depending on circumstances including but not limited to new water efficiency regulations or changes in water supply availability, CVWD may recommend preparation of an updated supply and demand assessment to support the WV. 49 8 References American Water Works Association Research Foundation, Commercial and Institutional End Uses of Water, 2000 California Department of Water Resources, Final State Water Project Delivery Capability Report 2019, August 2020 California Department of Water Resources, Results of the Indoor Residential Water Use Study, November 2021 California Department of Water Resources, State Water Project Historical Table A Allocations, Water Years 1996-2024, April 2024 Coachella Valley Water District, Coachella Water Authority, Desert Water Agency, Indio Water Authority, Mission Springs Water District, Myoma Dunes Mutual Water Company, 2020 Coachella Valley Regional Urban Water Management Plan, Water Systems Consulting, Inc., June 2021 Coachella Valley Water District, 2024-2025 Engineer’s Report on Water Supply and Replenishment Assessment, April 2023 Coachella Valley Water District, Landscape Ordinance 1302.5, July 2020 Coachella Valley Water District, Coachella Water Authority, Desert Water Agency, and Indio Water Authority, Indio Subbasin Annual Report for Water Year 2022-2023, Todd Groundwater Inc., March 2024 Coachella Valley Water District, Coachella Water Authority, Desert Water Agency, and Indio Water Authority, 2022 Indio Subbasin Water Management Plan Update/Alternative Plan Update, Todd Groundwater Inc., December 2021 Coachella Valley Water District, Desert Water Agency, and Mission Springs Water District, Mission Creek Subbasin Annual Report for Water Year 2022-2023, Wood Environment & Infrastructure Solutions Inc., February 2024 United States Bureau of Reclamation, Colorado River Accounting and Water Use Reports for Arizona, California, and Nevada