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TRI-VALLEY WATER AGENCIES I ES I Joint Tri-Valley Potable Reuse Technical Feasibility Study EXECUTIVE SUMMARY Introduction and Purpose The Water Supply Evaluation Update(2016 WSE Update)completed by Zone 7 Water Agency (Zone 7)in February 2016 underscored the need to pursue water supply options to enhance long- term water supply reliability for the Livermore-Amador Valley(Tri-Valley). Potential future water supply options identified in the WSE Update include the California WaterFix, desalination,and potable reuse.On February 11, 2016,participants in the Tri-Valley Water Policy Roundtable— including elected representatives from the cities of Dublin, Livermore, Pleasanton, San Ramon, DSRSD,and Zone 7—agreed to proceed in a more detailed study of potable reuse,which would be a local and drought-resistant supply. In response,the Tri-Valley Water Agencies,described further below,jointly funded and oversaw the effort to complete the Joint Tri-Valley Potable Reuse Technical Feasibility Study. The primary goals of this study are:1)to evaluate the feasibility of a wide range of potable reuse options for the Tri-Valley based on technical,financial,and regulatory considerations and 2) assuming that potable reuse is found to be technically feasible,to recommend next steps for the agencies. Project Participants The study is being conducted by the Tri-Valley Water Agencies. Each agency plays a role in water treatment and distribution,and/or wastewater collection and treatment,and recycled water production and distribution.The agencies and corresponding roles are as follows: • California Water Service(Cal Water)–Water retailer within the Livermore District. • City of Livermore–Water retailer and provider of wastewater collection/treatment services for the residents within its service area. • City of Pleasanton–Water retailer and provider of wastewater collection services within its service area. • Dublin San Ramon Services District(DSRSD)–Water retailer within its service area. Provider of wastewater collection and treatment services for Dublin and southern San Ramon,and wastewater treatment for Pleasanton. DSRSD and East Bay Municipal Utility District(EBMUD)formed the San Ramon Valley Recycled Water Program (SRVRWP).The program provides tertiary-treated recycled water to DSRSD,EBMUD, and Pleasanton irrigation customers at 558 locations. • Zone 7 Water Agency(Zone 7)–Wholesale water provider to the Cities of Livermore, Pleasanton, Dublin,and a portion of San Ramonl through the water retailer agencies listed above.Zone 7 also manages the local groundwater basin as the Groundwater Sustainability Agency for the Livermore Valley Groundwater Basin. Furthermore,Zone 7 provides flood protection in eastern Alameda County. A map showing the service areas is shown in Figure ES.1. 1 Served through an out-of-service area agreement with DSRSD.