How does ISD determine sewer charges?
The district's sewer service charges are designed to recover the cost of service based on long-term operating and capital funding requirements. The district bills residential customers a flat annual rate per dwelling unit and collects the sewer service charge on the property tax bill. Non-residential customers are billed based on the number of equivalent service units (ESUs) assigned to each customer. An ESU represents the wastewater discharge from a typical residential dwelling unit. The District assigns ESUs to non-resident customers based on estimated volume and strength of each customer's wastewater discharge in relation to that of a typical residence. To see how ratepayers' tax dollars are being spent, ISD has provided a copy of the annual budget for rate payers to view.

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1. I don't receive a bill from ISD. How am I charged for my sewer service?
2. How does ISD determine sewer charges?
3. What if I have questions on my ISD rate on my tax bill?