Laserfiche WebLink
Section 6 2025 Urban Water Management Plan <br />Water Supply Characterization City of Pleasanton <br /> Public Draft | May 2026 <br /> 6-33 EKI Environment & Water, Inc. <br /> Figure 6-7 Water Supplies – Current and Projected <br />6.10 Special Conditions <br />Special conditions related to water supplies (including climate change effects, regulatory conditions and <br />project development) are described in the following subsections. <br />6.10.1 Climate Change Effects <br />Pleasanton and its wholesaler, Zone 7, are committed to incorporating climate change into their ongoing <br />water supply planning. Section 4.7 of this UWMP includes a description of plausible changes to projected <br />demands under climate change conditions. <br />Since the SWP is the main source of Zone 7’s water supplies, climate change impacts to the SWP could <br />significantly impact Zone 7. Supplies derived from the SWP, including Table A deliveries, groundwater (i.e., <br />stored SWP water), and SWP carryover, represent roughly 90% of Zone 7’s supplies now and in the future. <br />As described in Section 6.1.2.1.2, the scenarios in the Draft 2025 DCR that were used for this UWMP <br />account for climate change impacts based on 2043 emissions level and 15 centimeter (cm) sea level rise; <br />therefore, these impacts have been incorporated into Zone 7’s water supply planning efforts. <br />In the 2022 WSE Update, Zone 7 evaluated the impacts of climate change on its water supplies (SWP, <br />Arroyo Valle, Main Basin) using a conservative risk-based analysis. As downscaling of climate change data <br />is further refined, the City will incorporate local climate change impacts in future UWMPs and other <br />planning efforts. <br />6.10.2 Regulatory Conditions and Project Development <br />Pleasanton currently plans to develop new wells in partnership with Zone 7 as described in Section 6.2.4. <br />This project is in response to PFAS detections and the subsequent decommissioning of Pleasanton’s <br />production wells. With the EPA’s recent adoption of MCLs for several PFAS compounds, this project is <br />particularly important for meeting water quality standards and maintaining the City’s access to safe and <br />reliable water supply. <br />0 <br />5,000 <br />10,000 <br />15,000 <br />20,000 <br />25,000 <br />2025 (Actual)2030 2035 2040 2045 <br />Wa <br />t <br />e <br />r <br /> <br />S <br />u <br />p <br />p <br />l <br />y <br /> <br />( <br />A <br />F <br />Y <br />) <br />Purchased or Imported Water Groundwater (not desalinated)Recycled Water