Estimate a monthly Washington water/sewer bill from gallons used and an approximate price.
Monthly water bill = gallons used ÷ 1,000 × an approximate Washington price of $7/1,000 gal, plus a sewer component tied to usage. Local districts tier rates and add fixed charges.
Bill
Bill = (gallons / 1000) × price + sewer share
Approximate rate only; confirm with your local water district.
It is a reference average; local utilities set tiered rates, connection fees and sewer percentages.
Rates are approximate state or national reference values. Local rates, exemptions and rules can differ, so treat the output as a planning figure only.