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Section 7 2025 Urban Water Management Plan <br />Water Supply Reliability Assessment City of Pleasanton <br /> Public Draft | May 2026 <br /> 7-8 EKI Environment & Water, Inc. <br />DDW can either adopt the EPA standards or set more stringent standards, which are then codified in Title <br />22 of the CCR. There are two general types of drinking water standards: <br />• Primary MCLs: health protective standards established using a very conservative risk-based <br />approach for each constituent that considers potential health effects, detectability and <br />treatability, and treatment costs. PWSs may not serve water that exceeds Primary MCLs for any <br />constituent. <br />• Secondary MCLs: standards based on the aesthetic qualities of the water such as taste, odor, <br />color, and certain mineral content, and are considered limits for constituents that may affect <br />consumer acceptance of the water. <br />Pleasanton and Zone 7 routinely monitor water quality in wells and treatment facilities, and the City <br />routinely monitors water quality in the distribution system to ensure that water delivered to customers <br />meets these drinking water standards. The results of this testing are reported to DDW following each test <br />and are summarized annually in Water Quality Reports (also known as “Consumer Confidence Reports”), <br />which are provided to customers electronically/ by mail and made available on Pleasanton’s website: <br />https://www.cityofpleasantonca.gov/our-government/pleasanton-water/water-quality-safety/. <br />Although there is the potential for some regulated constituents to be present in source water, as <br />documented in the Water Quality Reports, Pleasanton and Zone 7’s monitoring, management, and <br />treatment result in delivering high quality drinking water that meets all drinking water standards. <br />Pleasanton and Zone 7 tracks changes in constituent concentrations to proactively address water quality <br />issues before they impact supply reliability. If water quality constituents are detected in source water at <br />concentrations requiring treatment, Pleasanton and Zone 7 can implement appropriate treatment. <br />Further, as part of the siting process for all new wells, Pleasanton evaluates the presence of groundwater <br />contamination and avoids placing wells in areas of known contamination. <br />Additional water quality discussion specifically on purchased or imported water is provided in Section <br />7.1.1.1.2 and on groundwater in Section 7.1.2. Given Pleasanton and Zone 7’s proactive monitoring and <br />management of water quality in its source water supplies, water quality is not expected to impact the <br />reliability of Pleasanton and Zone’s available supplies within the planning horizon (i.e., through 2045). <br />7.1.5 Climate Change <br /> <br />Section 6.10.1 provides a summary of potential climate change impacts on supplies that Zone 7 has <br />considered when evaluating water supply availability and reliability. As discussed, Zone 7 is actively <br />working to further quantify and consider future climate change impacts as part of its ongoing supply and <br />operations planning. Zone 7’s 2025 UWMP provides additional details on how climate change effects were <br />incorporated into the reliability modeling of Zone 7’s SWP supplies and discusses DWR efforts to reduce <br />climate change impacts on the SWP. <br /> CWC §10631 (b) (1) <br />…For each source of water supply, consider any information pertinent to the reliability analysis conducted <br />pursuant to Section 10635, including changes in supply due to climate change.