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How Are Water and Sewer Measured?
Water meters measure in cubic feet.  Bills are calculated against “units” of measure.  One “unit” of water equal 100 cubic feet.  One cubic foot of water equals 7.48 gallons and so one “unit” of water equals 748 gallons. Twenty units (the minimum charge) thus equals 14,960 gallons of water.  Sewage rates are assessed against fresh water units, one-for-one.  For those customers who receive their fresh water directly from the Portsmouth system but dispose of their sewage through the town’s system, we obtain water readings from the city of Portsmouth to calculate the sewer bill.


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