2025 Urban Water Management Plan

2025 Urban Water Management Plan Executive Summary City of Pleasanton Public Draft | May 2026 ES-2 EKI Environment & Water, Inc. • Seismic Risk: Identify the seismic risk to the agency’s water facilities and have a plan to address identified risks; the region’s Local Hazard Mitigation Plan may address this requirement (see Section 8). • Energy Use Information: If data are available, include reporting on the amount of electricity used to obtain, treat, and distribute water (see Section 6). • Water Shortage Contingency Plan (WSCP): Update the City’s plan to include an annual process for assessing potential gaps between planned water supply and demands; conform with the State’s standard water shortage levels (including a shortage level greater than 50%) for consistent messaging and reporting; and provide water shortage responses that are locally appropriate (see Section 8). • Lay Description: Provide a lay description of the findings of the UWMP; this Executive Summary serves as the “Lay Description” for this 2025 UWMP. Major components and findings of the City’s 2025 UWMP are summarized below. City Water System The City’s water facilities convey, store, and deliver drinking (i.e., potable) water to its customers, which include City residents and commercial customers, as well as customers in unincorporated Alameda County. Currently, the City supplies all its drinking water with purchased treated water from Zone 7. The Zone 7 water enters the City’s distribution system at multiple turnout points. The City owns and operates its own distribution system which includes an extensive network of pipelines and pumping facilities to deliver drinking water to its customers. Besides drinking water, the City delivers recycled water to a portion of customers within its service area, mainly for landscape irrigation. Recycled water is highly treated wastewater that can be used for non-potable purposes like landscape irrigation, toilet flushing, and cooling. The City owns and operates a separate distribution system for recycled water, which includes storage, pumping, and a network of pipelines. Water Use by City Customers The City anticipates growth in the next 20 years, which would increase its demand for water. Thorough and accurate accounting of current and future water demands is critical for the City’s planning efforts. To continue delivering safe and reliable drinking water, the City must know how much water its customers currently use and how much they expect to use in the future. To help the City plan for enough water supply into the future, this UWMP uses a higher end estimate for future water demands. The City worked closely with Zone 7 to estimate water demands through the year 2045. This process involved reviewing the City’s development and planning documents. By 2045, the City’s potable and recycled water demand is expected to increase from 2025 levels by approximately 41% and 25%, respectively. City Water Supplies Historically, the City’s water supplies consisted of purchases from Zone 7 (approximately 80% of supply in 2020) and groundwater pumped by the City (approximately 20% of supply in 2020). In November 2022, Pleasanton stopped production in all three of its active wells due to the detection of per- and polyfluoroalkyl substances (PFAS). Between 2023 and 2025, the City purchased nearly 100% of its potable supply from Zone 7. The City and Zone 7 have partnered on the Joint Groundwater Wells project, which