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On May 15, 2018, the City Council voted to authorize staff, in coordination with the Tri- Valley Water Liaison Committee, to explore additional technical investigation of potable reuse technologies and further evaluate how potable reuse improves regional water supply reliability compared to other supply options with periodic updates to the City Council. Attachment 1 includes the May 15, 2018 City Council agenda report and meeting minutes. Attachment 2 provides a diagram showing the Joint Tri-Valley Potable Reuse Technical Feasibility Study Technical Evaluation next steps and decision points. Water Supply and Potable Reuse Next Steps The 2019 Water Supply Evaluation Update (2019 WSE Update) completed by Zone 7 in April 2019 reaffirmed and clarified the need to pursue water supply options to enhance long-term water supply reliability for the Livermore-Amador Valley. Potential future water supply, conveyance, and water storage options identified in the 2019 WSE Update include Sites Reservoir, Los Vaqueros Reservoir, potable reuse, short- and long-term water transfers, the California WaterFix (since renamed the Delta Conveyance), and regional desalination. At the July 24, 2019 meeting of the Tri-Valley Water Liaison Committee, the Committee discussed and supported further study of a regional potable reuse project. The Committee determined that joint collaborative efforts by the Tri-Valley water agencies should be undertaken to: 1) further study technical and institutional of potable reuse, 2) continue to evaluate other water supply reliability options, and 3) develop a community outreach/engagement program to educate the Tri-Valley residents and businesses on the region's water supply challenges and potential solutions. Committee representatives from the cities of Pleasanton and Livermore, DSRSD, and Zone 7 expressed support for joint funding of such efforts. Cal Water, a private investor-owned utility, may later become a partner in sharing the costs of further studies. To date, Zone 7, DSRSD, and the City of Livermore have entered a Task Order for $250,000 each to share in the costs of the associated studies. The City of Pleasanton and Cal Water have not entered a Task Order to participate in funding these studies. Other Related Studies At the January 22, 2020 meeting of the Tri-Valley Water Liaison Committee, Zone 7 staff provided an update on the Tri-Valley collaborative efforts and reviewed the scope of work and timeline for the jointly funded studies, and provided an update on other related efforts, including the Regional Demand Study, Chain of Lakes Hydraulic Modeling, Del Valle Water Treatment Plant Treatability Study, and the 2020 Urban Water Management Plan, which is to be submitted to the State by July 1 , 2021 . Other studies that were originally identified as next steps in the Tri-Valley Potable Reuse Technical Feasibility Study completed by Carollo Engineers in May 2018 have transitioned to broader water supply and water quality efforts that will benefit overall water reliability and groundwater quality and management, including PFAS-related issues. Attachment 3 is a schedule of Local Water Supply and Water Quality Studies, a description of jointly funded potable reuse studies and other efforts, status of studies, and funding costs. The Communications Strategic Plan is underway. Zone 7 has hired a consultant to develop a strategic plan for consistent regional communications on issues related to Tri- Page 3 of 5