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Cost-of-Service Methodology <br />•The total costs for the City’s sewer collection system are allocated based on <br />estimated wastewater flow by customer class <br />•Residential wastewater flow is estimated based on: <br />•Household size (household density analysis from census data, American Community Survey 2024) <br />•City-specific indoor water usage in gallons per capita per day (51 gpcd) <br />•Non-residential wastewater flow is estimated based on: <br />•Actual water usage data (FY 2025 actuals) <br />•Wastewater return factor based on average winter usage relative to average annual usage <br />•Cost-of-service aligns costs with estimated wastewater contribution by class <br />9 <br />Wastewater Flow Allocation by Class <br />10 <br />Current Cost <br />Allocation <br />Proposed Cost <br />Allocation <br />Est. Wastewater <br />Flow (ccf)Customer Class <br />81.4%76.6%1,953,229Residential <br />17.7%22.9%583,308Commercial/Industrial <br />0.9%0.5%12,087Institutional <br />100.0%100.0%2,548,624Total <br />Compared to current allocation, costs shift from Residential and Institutional customers to <br />Commercial/Industrial customers <br />9 <br />10 <br />Page 20 of 27