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2025 URBAN WATER MANAGEMENT PLAN <br /> MAY 2026/FINAL DRAFT/CAROLLO <br /> OCWD Engineer's Report <br /> The OCWD Engineer's Report documents groundwater conditions and evaluates water supply and basin <br /> utilization within OCWD's service area. The most recent report is the 2023-24 Engineer's Report released <br /> in February 2025.As reported, the BPP for the 2023-24 water year was established at 85 percent by the <br /> OCWD Board of Directors.The overall BPP achieved within OCWD for non-irrigation use was 83.8 percent, <br /> with the reduced achievement attributed primarily to PFAS-related well shutdowns. Groundwater stored in <br /> the basin increased by 56,000 AF for the 2023-24 water year, and the annual overdraft was 52,800 AF, <br /> which reflects the amount by which natural replenishment was exceeded. The increase in storage was <br /> supported by total groundwater recharge of 336,421 AF, including significant contributions from <br /> supplemental water and the GWRS. <br /> For the 2025-26 water year, OCWD is proposing to maintain a BPP of 85 percent. Under normal <br /> hydrologic conditions, groundwater production could reach approximately 315,000 AF; however, OCWD <br /> anticipates groundwater production during 2025-26 will be approximately 297,000 AF due to <br /> PFAS-related impacts that continue to limit well availability across several producers. <br /> It is estimated that approximately 8,000 AF of additional production above the BPP will be undertaken by <br /> the City of Tustin, City of Huntington Beach, Mesa Water District, and Irvine Ranch Water District to <br /> support groundwater quality improvement projects.As in prior years, groundwater produced above the <br /> BPP for these water-quality projects will be partially or fully exempt from the BEA due to the basin-wide <br /> benefit of pumping and treating poor-quality groundwater. <br /> During the 2023-24 water year, MET untreated full-service water supplies were available for groundwater <br /> replenishment; however, OCWD did not purchase replenishment water due to favorable basin storage <br /> conditions. OCWD likewise does not plan to purchase untreated full-service water for replenishment in <br /> 2025-26. <br /> 6.3.1.4 Recharge Management <br /> Recharging water into the OC Basin through natural and artificial means is essential to support pumping <br /> from the OC Basin. Recharge of groundwater began in 1949, in response to increasing drawdown of the <br /> OC Basin and, consequently, the threat of seawater intrusion.The OC Basin's primary source of recharge is <br /> supplied from the Santa Ana River, which is diverted into recharge basins and its main Orange County <br /> tributary, Santiago Creek. Other sources of recharge water include natural infiltration, recycled water, and <br /> imported water. Natural recharge consists of subsurface inflow from local hills and mountains, infiltration <br /> of precipitation and irrigation water, recharge in small flood control channels, and groundwater underflow <br /> to and from Los Angeles County and the ocean. <br /> Recycled water for OC Basin recharge is from two sources.The main source is the GWRS,which completed <br /> its final expansion in 2023 and now produces up to 130 mgd of advanced-purified water for recharge at <br /> the Talbert Seawater Barrier and in the Kraemer, Miller, Miraloma, and La Palma basins.The second source <br /> is recycled water purified at the Water Replenishment District of Southern California's (WRD) Leo J.Vander <br /> Lans Advanced Water Treatment Facility (LVL), which provides up to 8 mgd for injection at the Alamitos <br /> Seawater Barrier (owned and operated by the Los Angeles County Department of Public Works). In recent <br /> years,WRD's upgrades and operations have increased the use of recycled water at the Alamitos Barrier <br /> and reduced reliance on imported supplies. Injection of recycled water into these barriers is an ongoing <br /> CITY OF SANTA ANA <br />