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Residential sewer customers must know their History Based Consumption (HBC) in order to calculate their sewer bill.  The HBC is the average amount of water that a residential customer uses between November and February. This value will differ between customers. 

A residential customer’s HBC will be used year-round as the volume of wastewater produced.  Therefore, a residential customer will have the same sewer charge for 12-months.  HBC values are updated every March.