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3. Cost of Service Table 10 — Water System Functional Allocation of Costs 20 System Function FY 2025 Costs ($ Millions) Treatment $13.3M Transmission $1.7M Distribution $8.4M Customer $3.1 M Total Water System $26.6M Table 11 — Sewer System Functional Allocation of Costs System Function FY 2025 Costs ($ Millions) Treatment $12.5M Conveyance/Collection $12.5M Customer $1.6M Total Sewer System $26.7M 3.3 BULK USER RATES • IRCDUS has separate rates for customers that use bulk water and sewer services. Bulk sewer service is currently provided to the City of Fellsmere where bulk water service is available to be provided on an • emergency basis. These connections to IRCDUS' system allow them to bypass portions of the IRCDUS' water and sewer systems. The cost -of -service analysis determined the portion of each system's costs that were attributable to bulk users. Bulk rates were then developed separately for the water and sewer systems by utilizing the unit costs for each attributable functional component. 3.3.1 Bulk Wafer Rates Treatment including water supply and transmission2l related costs are allocable to all users, including bulk water customers. Costs allocated to the local distribution system are not allocable to bulk customers and are therefore excluded. The Utility's bulk water rates include only a volumetric rate per 1,000 gallons and therefore IRCDUS' unit costs for allocable costs to bulk customers were developed on that basis to reflect 20 Totals may not add due to rounding. 21 IRCDUS provided an inventory of water mains and identified segments by length and diameter as either distribution or transmission. Stantec then performed an inch -foot analysis as the basis for the allocation of costs between transmission (17%) which is allocable to all customers including bulk users and distribution (83%) which is only allocable to retail customers as summarized in Schedule 2 of Appendix B. M 22