EXHIBIT A
City of South San Francisco How Sewer Rates Are Calculated Residential Rates: Rates for residential properties are calculated by multiplying the number of dwelling units on each property by the annual rate per unit. Commercial and Institutional Rates: Restaurant, Institutional and Commercial Rates are calculated based on: A) The volume of annual water use at each property multiplied by the Inflow Rate; or B) The volume of annual sewer flow from each property multiplied by the Effluent Rate.
Industrial Rates: Industrial Rates are calculated based on the annual amount of flow, chemical oxygen demand and total suspended solids from each property. Separate charges are calculated for wastewater flow, Chemical Oxygen Demand and Suspended Solids, and then are added together to determine the total sewer charge for each property. Annual measurement and testing are performed at each property to confirm the flow and loadings. Septage Hauler Rates: Septage rates are calculated by multiplying the gallons of flow discharged from the septic pumper by the septage rate. Sewer Rates User Group Basis of Calculation
FY2022‐23 FY2023‐24 FY2024‐25 FY2025‐26 FY2026‐27
$/Unit/Year $/Unit/Year $/Unit/Year $/Unit/Year $/Unit/Year Single Unit Residential Dwelling Unit 768 791 815 839 864Multi‐Unit Residential Dwelling Unit 691 712 734 755 778Trailer Unit Residential Dwelling Unit 691 712 734 755 778Light Strength Commercial Minimum Charge 768 791 815 839 864 Hundred Cubic Feet Inflow 9.87 10.17 10.48 10.79 11.11
or Hundred Cubic Feet Effluent 10.97 11.30 11.64 11.99 12.34 Moderate Strength Commercial Minimum Charge 768 791 815 839 864 Hundred Cubic Feet Inflow 15.45 15.91 16.39 16.88 17.39 or Hundred Cubic Feet Effluent 17.17 17.68 18.21 18.76 19.32 Restaurants Minimum Charge 768 791 815 839 864
Hundred Cubic Feet Inflow 22.57 23.25 23.95 24.67 25.41 or Hundred Cubic Feet Effluent 25.08 25.83 26.61 27.41 28.23 Institutions Minimum Charge 768 791 815 839 864
Hundred Cubic Feet Inflow 7.96 8.20 8.45 8.70 8.96
or Hundred Cubic Feet Effluent 8.84 9.11 9.39 9.67 9.96 Industrial Minimum Charge 768 791 815 839 864
Hundred Cubic Feet Inflow 5.91 6.09 6.27 6.46 6.65
or Hundred Cubic Feet Effluent 6.57 6.77 6.97 7.18 7.39 Chemical Oxygen Demand Pounds 0.6130 0.6314 0.6503 0.6698 0.6899 Total Suspended Solids Pounds 1.9848 2.0443 2.1056 2.1688 2.2339 Septage Haulers Charge per Gallon 0.42 0.43 0.44 0.45 0.46 Maximum Rates