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2025 URBAN WATER MANAGEMENT PLAN <br /> MAY 2026/FINAL DRAFT/CAROLLO <br /> 6.3 Local Groundwater <br /> Among all local supplies available to the City's service area, groundwater supplies make up the majority, <br /> with the primary supply from the OC Basin. The water supply resources within the City's service area are <br /> enhanced by the existence of groundwater basins,which provide a reliable local source and, additionally, <br /> are used as reservoirs to store water during wet years and draw from storage during dry years. The City <br /> operates 21 groundwater wells with 11 currently in service. Construction of per- and polyfluoroalkyl <br /> substances (PFAS) treatment facilities at several wells is ongoing and the wells will be returned to service <br /> after construction is complete. One well is currently being rehabilitated and should return to service by <br /> spring 2026. Five wells are currently offline but are planned to be brought back into service in the future. <br /> Table 6.8 shows a breakdown of historical groundwater production by the City. <br /> This section describes the groundwater basin(s) used by the City and provides a 25-year projection of the <br /> service area's groundwater supply. <br /> Table 6.8 Groundwater Pumped in the Past Five Years within the City's Service Area <br /> Submittal Table 6-1 Retail: Groundwater Volume Pumped <br /> Water Code Section 0. i . <br /> 2021 2022 2023 2024 2025 <br /> Groundwater Type Location or Basin Name <br /> (AF) (AF) (AF) (AF) (AF) <br /> Alluvial Basin Orange County Groundwater Basin 26,081 25,259 22,557 26,651 28,615 <br /> Total 26,081 25,259 22,557 26,651 28,615 <br /> NOTES: Source-MWDOC,2025 <br /> I ' Orange County Groundwater Bas4 <br /> This section describes the OC Basin and the management measures taken by OCWD, the basin manager <br /> and member agency of MWDOC, to optimize local supply and minimize overdraft. <br /> The OCWD was formed in 1933 by a special legislative act of the California State Legislature to protect <br /> and manage the County's vast, natural, groundwater supply using the best available technology and <br /> defend its water rights to the OC Basin.This legislation is found in the State of California Statutes, Water- <br /> Uncodified Acts,Act 5683, as amended. The OC Basin is managed by OCWD under the Act,which <br /> functions as a statutorily-imposed physical solution. The OCWD Management Area includes <br /> approximately 89 percent of the land area of the OC Basin, and 98 percent of all groundwater production <br /> occurs within the area.Approximately 2.5 million residents live within OCWD's boundaries and rely upon <br /> the basin for their primary water supply. OCWD manages water resource monitoring programs, land use <br /> elements related to basin management, groundwater elevation, groundwater quality, and coastal area <br /> monitoring through a number of monitoring programs. OCWD monitors the basin by collecting <br /> groundwater elevation and quality data from approximately 400 OCWD-owned wells and manages an <br /> electronic database that stores water elevation,water quality, production, recharge, and other data on <br /> over 2,000 wells and facilities within and outside OCWD boundaries (OCWD, 2023). For detailed <br /> monitoring programs and management information, refer to the 2022 Basin 8-1 Alternative Plan <br /> (Appendix Q. <br /> Groundwater levels are managed within a safe basin operating range to protect the long-term <br /> sustainability of the OC Basin and to protect against land subsidence. OCWD, a member of agency of <br /> CITY OF SANTA ANA <br />