2025 Urban Water Management Plan

Section 6 2025 Urban Water Management Plan Water Supply Characterization City of Pleasanton Public Draft | May 2026 6-9 EKI Environment & Water, Inc. Figure 6-2 Groundwater Basins within Zone 7’s Service Area 6.2.2 Pre-SGMA Groundwater Management Before SGMA took effect, Zone 7 managed the Basin under its 2005 Groundwater Management Plan (GMP), which was developed to comply with the requirements set forth in the California Groundwater Management Planning Act (Water Code Section 10750, et seq.). The GMP established a formal framework for monitoring, protecting, and managing groundwater resources within the Basin. As part of the GMP, Zone 7 incorporated a Salt and Nutrient Management Plan to address long-term groundwater quality protection. In addition to monitoring and planning efforts, Zone 7 actively managed the Basin through conjunctive use operations, including artificial recharge using imported and local surface water supplies. 6.2.3 Groundwater Management Under SGMA In 2014, the California State Legislature enacted SGMA with subsequent amendments in 2015. SGMA requires the formation of GSAs and the development and implementation of GSPs or Alternative GSPs for groundwater basins that are designated by DWR as medium or high priority. As discussed above, the Basin is medium priority and therefore subject to the requirements of SGMA. Zone 7 is the exclusive GSA for the Basin. Under SGMA, Zone 7 submitted an Alternative GSP to DWR in December 2016. The Alternative GSP documented Zone 7’s longstanding conjunctive use program, monitoring network, groundwater conditions, pumping management policies, and water quality protection efforts, all of which collectively demonstrate sustainable basin management. DWR approved the Alternative GSP on July 17, 2019. Zone 7 submitted its first Five-Year Periodic Evaluation of the Alternative GSP (2021 Alt-GSP) in December 2021 to reflect updated Basin conditions, monitoring data, and refinements to sustainability criteria and