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18 (1) The estimated total costs, and the proposed method of financing the costs, associated with acquiring the additional water supplies. (2) All federal, state, and local permits, approvals, or entitlements that are anticipated to be required in order to acquire and develop the additional water supplies. (3) Based on the consideration set forth in paragraphs (1) and (2), the estimated timeframes within which the public water system, or the city or county if either is required to comply with this part pursuant to subdivision (b), expects to able to acquire additional water supplies. The current reliability of the City’s water supply is largely dependent upon its water supply contract with SFPUC and SFPUC’s water supply reliability. The reliability discussion provided below is based on the City’s 2020 UWMP (adopted in June 2021) and the SFPUC 2020 UWMP (also adopted in June 2021). 6.1 SFPUC Regional Water System Reliability Information regarding the reliability of the SFPUC RWS was provided to the City by BAWSCA, in coordination with SFPUC, during the preparation of the City’s 2020 UWMP. The following sections describe the potential impacts of the 2018 Bay-Delta Plan Amendment on SFPUC RWS reliability, allocation of RWS supplies during supply shortages, as well as SFPUC’s Alternative Water Supply Planning Program designed to investigate and plan for new water supplies to address future long-term water supply reliability challenges and vulnerabilities on the RWS. 6.1.1 Potential Impacts of the 2018 Bay-Delta Plan Amendment on SFPUC RWS Reliability In December 2018, the SWRCB adopted amendments to the Water Quality Control Plan for the San Francisco Bay Sacramento-San Joaquin Delta Estuary (Bay-Delta Plan Amendment) to establish water quality objectives to maintain the health of the Bay-Delta ecosystem. The SWRCB is required by law to regularly review this plan. The adopted Bay-Delta Plan Amendment was developed with the stated goal of increasing salmonid populations in three San Joaquin River tributaries (the Stanislaus, Merced, and Tuolumne Rivers) and the Bay-Delta. The Bay- Delta Plan Amendment requires the release of 40 percent of the “unimpaired flow” on the three tributaries from February through June in every year type, whether wet, normal, dry, or critically dry. The SWRCB has stated that it intends to implement the Bay-Delta Plan Amendment on the Tuolumne River by the year 2022, assuming all required approvals are obtained by that time. But implementation of the Plan Amendment has not occurred to date and is uncertain for several reasons: • Since adoption of the Bay-Delta Plan Amendment, over a dozen lawsuits have been filed in both state and federal court, challenging the SWRCB’s adoption of the Bay-Delta Plan Amendment, including two legal challenges filed by the federal government, at the request of the U.S. Department of Interior, Bureau of Reclamation in state and federal courts. These cases are in the early stage and there have been no dispositive court rulings to date. • The Bay-Delta Plan Amendment is not self-implementing and does not allocate responsibility for meeting its new flow requirements to the SFPUC or any other water rights holders. Rather, the Plan ATTY/RESO.0027/CC RESO WATER SUPPLY ASSESSMENT (920 SHASTA) - EXHIBIT A REV: 04-22-25 VR Page 18 of 42