How is a sewer bill calculated?
Many sewer bills multiply billed sewer volume by a sewer rate, then add a fixed sewer service charge. Billed sewer volume may equal water use, a percentage of water use, or a capped winter average.
Sewer bill calculator
Estimate sewer charges from water use, CCF rates, and fixed fees.
Use this when the sewer line item is the confusing part of a water bill. Convert gallons to CCF, apply billed sewer percentage or winter average caps, then add fixed charges.
Water bill
$114
Water use$46.00
Sewer$41.00
Service$27.00
All-in rate
$15.83 per 1k gal
Best next check
Leak and irrigation
Sewer bill inputs
Convert water use into billed sewer CCF, then add the sewer rate and fixed monthly charge.
Estimated sewer bill
$84.83
$60.83 usage charge plus $24.00 fixed sewer charges.
Billed sewer usage
7 CCF
7 CCF of metered water before sewer rules are applied.
Daily sewer cost
$2.83
Estimated sewer cost divided by the number of billing days.
Effective cost
$16.31
All-in sewer cost per 1,000 gallons of metered water.
Sewer billing note
Sewer bills often follow water use, but the utility may cap billed sewer volume or exclude outdoor use.
If your bill lists units in gallons instead of CCF, divide gallons by 748 to estimate CCF. If it lists sewer as a flat monthly charge, set the sewer rate to 0 and enter the charge as the base fee.
Water and sewer tools to use next
Water bill calculator
Estimate water usage charges, base fees, sewer fees, stormwater, and the total bill.
Open pageSewer charge explained
Understand why sewer charges appear on a water bill and which parts may be fixed.
Open pageWhy is my water bill so high?
Check gallons, sewer, leaks, irrigation, meter reads, and fixed fees before calling the utility.
Open pageFAQ
Short answers for search visitors and bill-checking moments.
Why is my sewer bill higher than my water bill?
Sewer rates can be higher than water rates, and fixed sewer charges can be large. Some bills also include wastewater treatment, infrastructure, or minimum charges.
What is a winter average cap on a sewer bill?
A winter average cap limits billed sewer volume based on lower winter water use. It is often used so outdoor summer water use does not fully increase sewer charges.