RES 2026043 - Laserfiche WebLink

Section 6 2025 Urban Water Management Plan Water Supply Characterization City of Pleasanton Public Draft | May 2026 6-7 EKI Environment & Water, Inc. in San Luis Reservoir is available. Zone 7 can lose water stored in San Luis Reservoir if the reservoir “spills” (i.e., DWR needs the storage capacity to store its SWP water) during a wet year. Zone 7 typically targets storing approximately 10,000 AFY of its Table A allocation as carryover in San Luis Reservoir. DWR is considering expanding the San Luis Reservoir by 130,000 AF, as further discussed in Zone 7’s 2025 UWMP. 6.2 Groundwater This section describes the City’s groundwater supply and Zone 7’s management of the Basin as the exclusive Groundwater Sustainability Agency (GSA) within its jurisdictional boundaries (Figure 6-2) as identified under the 2014 Sustainable Groundwater Management Act (SGMA). Zone 7’s management of the Basin began over 50 years ago, long preceding the State’s implementation of SGMA.9 Each year, Zone 7 prepares an Annual Report which provides updates on groundwater conditions in the basin and the status of Zone 7’s groundwater management actions (Zone 7, 2026). The 2025 Water Year Annual Report can be found on the Zone 7’s website.10 6.2.1 Basin Description and Status Pleasanton relies on groundwater from the Livermore Valley Groundwater Basin (Basin; DWR No. 2-10). The City’s local groundwater supply is within the Main Basin, which is the portion of the Basin that contains high-yielding aquifers and generally produces the best-quality groundwater. 9 Zone 7, 2021. Alternative Groundwater Sustainability Plan for the Livermore Valley Groundwater Basin, dated December 2021. Accessed From: https://sgma.water.ca.gov/portal/alternative/periodiceval/preview/8. 10 https://www.zone7waterca.gov/sites/main/files/file-attachments/2-010_wy_2025.pdf?1774635392  CWC §10631 (b) Identify and quantify, to the extent practicable, the existing and planned sources of water available to the supplier over the same five-year increments described in subdivision (a), providing supporting and related information, including all of the following: (4) If groundwater is identified as an existing or planned source of water available to the supplier, all of the following information: (A) The current version of any groundwater sustainability plan or alternative adopted pursuant to Part 2.74 (commencing with Section 10720), any groundwater management plan adopted by the urban water supplier, including plans adopted pursuant to Part 2.75 (commencing with Section 10750), or any other specific authorization for groundwater management for basins underlying the urban water supplier’s service area. (B) A description of any groundwater basin or basins from which the urban water supplier pumps groundwater. For basins that a court or the board has adjudicated the rights to pump groundwater, a copy of the order or decree adopted by the court or the board and a description of the amount of groundwater the urban water supplier has the legal right to pump under the order or decree. For a basin that has not been adjudicated, information as to whether the department has identified the basin as a high- or medium-priority basin in the most current official departmental bulletin that characterizes the condition of the groundwater basin, and a detailed description of the efforts being undertaken by the urban water supplier to coordinate with groundwater sustainability agencies or groundwater management agencies listed in subdivision (c) of Section 10723 to maintain or achieve sustainable groundwater conditions in accordance with a groundwater sustainability plan or alternative adopted pursuant to Part 2.74 (commencing with Section 10720). (C) A detailed description and analysis of the location, amount, and sufficiency of groundwater pumped by the urban water supplier for the past five years. The description and analysis shall be based on information that is reasonably available, including, but not limited to, historic use records.