2025 Urban Water Management Plan

Section 6 2025 Urban Water Management Plan Water Supply Characterization City of Pleasanton Public Draft | May 2026 6-16 EKI Environment & Water, Inc. Pleasanton collects all the wastewater from its service area. Most of the city’s sewage flow is conveyed to DSRSD’s RWTF; however, wastewater generated from the Ruby Hills housing development is conveyed to Livermore’s Water Reclamation Plant (LWRP) for treatment. Both facilities produce Title 22 tertiary disinfected recycled water, which Pleasanton then distributes to customers for non-potable uses to offset potable demands. The sections below describe the collection, treatment and discharge of wastewater as well as the coordination and use of recycled water within Pleasanton’s service area. 6.5.1 Recycled Water Coordination In the early 1990s, DSRSD, Livermore, and Zone 7 undertook a Tri-Valley recycled water study and conducted a series of public workshops. As a result of that effort, the SWRCB issued a Master Water Recycling Permit (Order No. 93159) to the three agencies in December 1993. The permit established the requirements for recycled water irrigation, groundwater recharge, and other Title 22 approved projects. DSRSD is responsible for treating and discharging treated wastewater for the cities of Dublin, South San Ramon, and Pleasanton. In addition, DSRSD owns and operates a water recycling plant at the RWTF and participates in DERWA, a joint powers authority between DSRSD and EBMUD that operates the SRVRWP. The SRVRWP provides recycled water that meets Title 22 disinfected tertiary recycled water requirements. The recycled water primarily serves landscape irrigation customers of DSRSD and EBMUD in the cities of San Ramon and Dublin (including Dougherty Valley) and the towns Danville and Blackhawk in Alameda and Contra Costa counties. Pleasanton began using recycled water from DERWA facilities in 2014 and plans to continue connecting remaining parcels along the distribution system. Wastewater produced from Pleasanton’s Ruby Hills housing development is sent to the LWRP. The City receives recycled water from Livermore for landscape irrigation servicing new development in the eastern portion of the City, referred to as the Staples Ranch region, which terminates at El Charro Road. These two recycled water sources are described below. 6.5.1.1 DSRSD-EBMUD Recycled Water Authority Currently, wastewater from Dublin, Pleasanton, and the southern portion of San Ramon are treated at DSRSD’s RWTF. A portion of the secondary effluent is routed to DSRSD’s water recycling plant for tertiary treatment and distribution through DERWA facilities. DSRSD coordinates with the planning departments in the cities of Dublin and San Ramon, Alameda and Contra Costa counties, and the U.S. Army Reserve to ensure that recycled water is used where it is available. DSRSD and EBMUD work together to manage recycled water supply demands. Pleasanton and DSRSD each own 8.5 million gallons per day (MGD) of secondary treatment capacity at the DSRSD RWTF. Pleasanton maintains the first right to use the secondary effluent produced from wastewater originating from Pleasanton’s wastewater collection system for recycling. DSRSD maintains the first right to use secondary effluent produced from the DSRSD collection system for recycling. According to the 2003 DERWA Water Sales Agreement, all recycled water produced by DSRSD is delivered to DERWA for subsequent wheeling to the EBMUD and DSRSD water service areas. DSRSD’s tertiary treatment capacity is 16.2 MGD. Recycled water is delivered by DERWA on a first come first serve basis. In 2019, DERWA determined that the SRVRWP cannot meet the combined peak demands of its member agencies (DSRSD and EBMUD) and Pleasanton (a retailer to DERWA). Thus, DERWA passed Resolution No. 19-3 (Appendix E) establishing a moratorium on new recycled water connections and requesting that its members and the City take action to reduce recycled water demands. DSRSD monitors recycled water uses and files reports with DDW and the San Francisco Bay Regional Water Quality Control Board (RWQCB), in conformance with DSRSD’s General Water Reuse Order No. WQ 2016- 0068-DDW (General Order 2016).