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Page 4 of 19 21418818.2 Purchases (up to its ISG or proxy). This establishes the upper limit of each Wholesale Customer’s potential final allocation. The Minimum Cutback, expressed as a percentage, is equal to 1/3 times the Overall Average Wholesale Customer Reduction, but no less than 5%. Maximum Cutback: The Maximum Cutback establishes the lower limit of each Wholesale Customer’s potential final allocation. The Maximum Cutback, expressed as a percentage, is equal to 1.5 times the Overall Average Wholesale Customer Reduction. The Maximum Cutback is calculated from each Wholesale Customer’s Base Period SFPUC Purchases (up to its ISG, or proxy). Step 1 Override Exception: If a Wholesale Customer’s allocation in Step 1 exceeds the upper limit established by the Minimum Cutback at 1/3 times the Overall Average Wholesale Customer Reduction, the Wholesale Customer’s Minimum Cutback will be reduced, but the Minimum Cutback will be no less than 5%. Calculations and an example of the Step 1 Override Exception are provided in Attachment B. Step 1: Efficient Residential Allocation Step 1 allocates water on a residential per capita basis, based on the State Indoor Water Use Efficiency Standard1 and the portion of each Wholesale Customer’s water demand met by the RWS. The per capita efficient residential volume, in gallons, will align with the State Residential Indoor Water Use Efficiency Standard, established as 47 gallons per capita per day (GPCD) through 2029 and 42 GPCD beginning in 2030. This step multiplies the per-capita volume by each Wholesale Customer’s Population and Base Period SFPUC Reliance to determine the total amount of supply allocated to each Wholesale Customer in this step. Step 2: Non-Residential Base Allocation Step 2 allocates water based on each Wholesale Customer’s estimated non-residential indoor/base demand. To calculate non-residential indoor/base demand, each Wholesale Customer’s Base Period SFPUC Purchases are multiplied by: •Base Period Percent Indoor Demand •Base Period Percent Non-Residential Demand •Non-Residential Base Allocation Factor – this is equal to one minus 50% of the Overall Average Wholesale Customer Reduction. o For example, in a 20% Overall Average Wholesale Customer Reduction, the Non-Residential Base Allocation Factor will be 90% (1 – (20% ÷ 2)) of each Wholesale Customer’s non-residential indoor/base demand. 1 SB 1157, signed into law in September 2022, established the standard for efficient indoor residential water use be 47 gallons per capita per day (“GPCD”), lowering to 42 GPCD in 2030. ATTY/RESO.0092/CC RESO APPROVING TIER 2 DROUGHT RESPONSE IMPLEMENTATION PLAN (WATER SUPPLY AGREEMENT) - EXHIBIT A REV: 08-18-25 MI Page 6 of 21