Water & Sewer Bill Calculator
Estimate a monthly water and sewer bill from gallons, variable prices, and fixed charges.
Estimate a monthly water bill
How this calculator works
Many utilities bill water and sewer separately, and both may include fixed service charges. This flat-rate estimate works best when your bill has one variable price per 1,000 gallons.
Tiered blocks, meter-size charges, minimum bills, seasonal irrigation rates, taxes, stormwater fees, and sewer caps may require a more detailed tariff calculation.
At 6,000 gallons, $6 water plus $8 sewer per 1,000 gallons, and $25 fixed charges, the estimated bill is $109 per month.
How to get a more accurate estimate
- Use billed gallons rather than an assumed household average.
- Separate fixed charges from per-unit water and sewer prices.
- Check whether sewer volume is capped, averaged, or excluded for irrigation meters.
Frequently asked questions
Why is sewer sometimes more expensive than water?
Wastewater collection and treatment have separate infrastructure and operating costs.
Does this handle tiered rates?
No. Use a blended effective rate or calculate each tier separately.
Are stormwater charges included?
Only if you add them to fixed monthly charges.
Results use the values you enter and the formula shown above. Real bills can include taxes, minimum charges, tiers, time-of-use pricing, cycling losses, and other adjustments. Use a recent bill or a plug-in energy meter when accuracy matters.