2025 Urban Water Management Plan

Section 6 2025 Urban Water Management Plan Water Supply Characterization City of Pleasanton Public Draft | May 2026 6-25 EKI Environment & Water, Inc. 6.6 Desalinated Water Opportunities Due to infeasibility, Pleasanton is not considering the development of a desalinated water system as a source of water within the planning horizon. This includes ocean water, brackish water, and groundwater desalination (though Zone 7 desalinates a portion of its groundwater). 6.7 Water Exchanges and Transfers Pleasanton currently does not have any potable water transfer agreements, nor does the Pleasanton anticipate participating directly in any such transfer opportunities in the future. Pleasanton has two existing pipeline interties with DSRSD and one pipeline intertie with the Livermore for rapid emergency response. These interties are strictly for emergency conditions, such as a major pipeline break, supply contamination, or water service interruption due to earthquakes, floods, or other disasters. Zone 7 periodically supplements existing supplies with short-term transfers when needed and intends to more regularly acquire transfer water over the coming decade until major supply reliability project(s) come online starting around 2035. The proposed water transfers include supply from the Yuba Accord and the Dry Year Transfer Program (DYTP) administered by the SWCs. Transfers could also involve agreements between Zone 7 and other SWCs and/or between Zone 7 and other water purveyors. The DYTP coordinates and negotiates water sales between interested SWCs and sellers in the Feather River watershed. The most expedient and cost-effective transfer option is likely a transfer agreement with another SWC using the SWP system that Zone 7 already invests in. Transfer water would be conveyed to Zone 7 through the Delta and the SBA; the transfer amount could vary from year-to-year depending on hydrology. For the 2025 UWMP, Zone 7 is assuming 3,000 AFY in water transfers through 2035. Additionally, in some years, Zone 7 participates in water transfers as a seller. For example, this was the case in 2023 and 2025 when Zone 7 transferred 8,000 AF and 4,000 AF (respectively) to other SWCs. These transfers were non-permanent Table A transfers. Zone 7 will continue to pursue and evaluate transfer opportunities in the Bay Area and statewide. Through the Bay Area Regional Reliability (BARR) Partnership, Zone 7 participated in a regional project, funded in part by a U.S. Bureau of Reclamation grant, to develop the Bay Area Shared Water Access Program that identified water transfer opportunities and a roadmap to facilitate transfers and exchanges among water suppliers the Bay Area. As discussed in Section 6.8.1.1, the Delta Conveyance Project may also create opportunities for long-term water transfers between SWCs across the state.  CWC §10631(g) A plan shall be adopted in accordance with this chapter and shall do all of the following: Describe the opportunities for development of desalinated water, including, but not limited to, ocean water, brackish water, and groundwater, as a long-term supply.  CWC §10631 (c) A plan shall be adopted in accordance with this chapter and shall do all of the following: Describe the opportunities for exchanges or transfers of water on a short-term or long-term basis.