Planning Commission Agenda Packet 09092026

City of Pleasanton—Additional Housing Sites Rezonings Project Addendum CEQA Guidelines Section 15164 Addendum 134 b) Water Supply Would the project: Have sufficient water supplies available to serve the project and reasonably foreseeable future development during normal, dry and multiple dry years? Summary of Prior FEIR The Prior FEIR found that Zone 7’s long-term water supply projections show that sustainable yield from all sources is expected to meet regional demand through 2025, with sufficient buffer to accommodate drought years. The City’s share of total Zone 7 demand, approximately one-third, would remain proportionally stable even with population growth anticipated under General Plan buildout. Although the City’s total water demand would increase by 2025, this increase would remain within Zone 7’s projected sustainable supply. Temporary shortages could occur during drought or periods of reduced SWP deliveries, but the City’s staged water-shortage contingency plan and General Plan policies promoting water conservation and supply sustainability would reduce these effects. Overall, cumulative development under the General Plan would not exceed Zone 7’s sustainable water supply, and the City’s proportional demand would remain consistent with regional projections. With existing conservation measures, contingency planning, and General Plan policies in place, water supply impacts associated with buildout would remain less than significant. Proposed Project Analysis and Conclusion The City’s groundwater supply wells (20 percent of the City’s total water supply) are still currently out of commission due to polyfluoroalkyl substances (PFAS) concerns. However, the City has since approved plans for the construction of new groundwater wells as well as an upgrade of the existing Zone 7 Hopyard Treatment Facility, which would have connection to the new groundwater wells. The project is slated to complete construction in early to mid-2029.13 The new groundwater supply would recover the use of the decommissioned groundwater supply wells. As explained in Section 2, Project Description, maximum buildout of the proposed sites is within the scope of and would result in fewer housing units than what was analyzed in the certified Housing Element Update FEIR. 13 City of Pleasanton. Joint Groundwater Wells Project. Website: https://www.cityofpleasantonca.gov/our- government/pleasanton-water/joint-groundwater-wells- project/#:~:text=The%20target%20completion%20date%20for,to%20operate%20are%20in%20place. Accessed November 17, 2025.