CITY COUNCIL REGULAR MEETING AGENDA 9-15-26

28 demand mitigation measures for each level, including landscape irrigation restrictions, water waste prohibitions codified in Pleasanton Municipal Code Chapter 9.30, conservation pricing adjustments, and prohibitions on the use of potable water for construction activities. At the most severe shortage level (Level 6), the WSCP authorizes the City to request an expansion of its groundwater pumping quota from Zone 7 as a supply augmentation measure. The WSCP also establishes an annual process for the City to assess potential gaps between planned water supply and demand for the current year and the next potentially dry year, consistent with the annual assessment requirements under CWC § 10632(a). The Plan additionally addresses seismic risk, energy use reporting, and climate change considerations as mandated by subsequent legislative amendment. The Plan also addresses the City's groundwater supply within the regulatory framework of the Sustainable Groundwater Management Act of 2014 (SGMA). The City draws groundwater from the Livermore Valley Groundwater Basin (DWR Basin No. 2-10), which is designated by DWR as a medium-priority basin and is therefore subject to SGMA's requirements for the development and implementation of a Groundwater Sustainability Plan or Alternative Groundwater Sustainability Plan. Zone 7, serving as the exclusive Groundwater Sustainability Agency for the Basin, submitted an Alternative Groundwater Sustainability Plan to DWR in December 2016, which was approved by DWR on July 17, 2019. Zone 7 submitted its first Five- Year Periodic Evaluation of the Alternative GSP in December 2021, and DWR approved that evaluation in June 2024, confirming that the Basin continues to be managed sustainably. Under the Alternative GSP, Zone 7 manages the Basin through a conjunctive use strategy that balances natural and artificial recharge against groundwater extraction, maintaining groundwater levels within a defined operational storage band of approximately 126,000 acre- feet. The City holds a groundwater pumping quota of 3,500 acre-feet per year from the Basin's natural sustainable yield of 13,400 acre-feet per year; however, the City ceased production from its municipal wells in November 2022 due to the detection of per- and polyfluoroalkyl substances (PFAS). The City and Zone 7 are currently advancing the Joint Groundwater Wells project to construct new production wells in the Bernal Subbasin outside the known PFAS contamination plume, with operations anticipated by 2030. Zone 7 is also actively implementing a broader PFAS management strategy, including installation of PFAS treatment systems and enhanced monitoring, and continues to manage additional constituents of concern, including salinity under its Salt and Nutrient Management Plan and hexavalent chromium in anticipation of the SWRCB's reduced maximum contaminant level of 10 μg/L effective October 1, 2026. General. The City is not aware of any environmental or regulatory issues that would materially adversely impact its ability to deliver water. The City previously received a citation from the California State Water Resources Control Board, Division of Drinking Water (DDW), related to disinfection byproduct (DBP) levels in a limited portion of the City's water system serving the Kilkare service area. The matter was localized to this service area and did not impact the City's ability to provide reliable water service to its customers. The City promptly implemented an operational mitigation plan that successfully reduced DBP concentrations below the applicable maximum contaminant levels (MCLs). The City has maintained compliance with applicable MCL requirements for multiple consecutive quarters, and DDW has recognized the City's successful efforts in addressing the DBP exceedance and confirmed that the City has completed the necessary actions and met the applicable requirements and directives to return the water system to compliance. Water Quality. The applicable drinking water standards for the Water System are provided in the California Domestic Water Quality and Monitoring Regulations, Title 22 of the California Administrative Code. These regulations incorporate the requirements of the U.S. Page 238 of 318