Item 28 - Urban Water Management Plan and Water Shortage Contingency Plan

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Santa Ana 2020 Water Shortage Contingency Plan 3-6 The City has documented that it is 100% reliable for single dry year demands from 2025 through 2045 with a demand increase of 6% from normal demand with significant reserves held by MET, local groundwater supplies, and conservation (Santa Ana, 2021a). Infrastructure Considerations The Annual Assessment will include consideration of any infrastructure issues that may pertain to near-term water supply reliability, including repairs, construction, and environmental mitigation measures that may temporarily constrain capabilities, as well as any new projects that may add to system capacity. Following is a list of considerations that have the potential to negatively impact water supply reliability and will be considered in the Annual Assessment:  MWD pipeline outages (Orange County Feeder and/or East Orange County Feeder #2).  City currently has 5 groundwater wells placed out of service due to per- and polyfluoroalkyl substances (PFAS) contamination.  Planned well/pump station rehabilitation/construction projects including Well 32 and Garthe Pump Station. Following is a list of considerations that have the potential to positively impact water supply reliability and will be considered in the Annual Assessment:  Drilling of new wells currently planned for Washington Well & Flower Well.  Expansion of recycled water customers and system.  AMI project implementation (expected to result in lower water use and less system losses). Other Factors For the Annual Assessment, any known issues related to water quality would be considered for their potential effects on water supply reliability. PFAS are a group of thousands of manmade chemicals that includes perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS). PFAS compounds were once commonly used in many products including, among many others, stain- and water-repellent fabrics, nonstick products (e.g., Teflon), polishes, waxes, paints, cleaning products, and fire-fighting foams. Beginning in the summer of 2019, the California State Division of Drinking Water (DDW) began requiring testing for PFAS compounds in some groundwater production wells in the OCWD area. The City has PFAS contamination in 5 wells. PFAS are of particular concern for groundwater quality, and since the summer of 2019, DDW requires testing for PFAS compounds in some groundwater production wells in the OCWD area. In February 2020, the DDW lowered its Response Levels (RL) for PFOA and PFOS to 10 and 40 parts per trillion (ppt) respectively. The DDW recommends Producers not serve any water exceeding the RL – effectively making the RL an interim Maximum Contaminant Level (MCL) while DDW undertakes administrative action to set an MCL. In response to DDW’s issuance of the revised RL, as of December 2020, approximately 45 wells in the OCWD service area have been temporarily turned off until treatment systems can be constructed. As additional wells are tested, OCWD expects this figure may increase to at least 70 to 80 wells. The state has begun the process of establishing MCLs for PFOA and PFOS and anticipates these MCLs to be in effect by the Fall of 2023. OCWD anticipates the MCLs will be set at or below the RLs.