Fee estimate
Monthly fee = impervious area / billing unit size x local rate. Credit estimate applies a percentage reduction.
RainYard Tools
Utility fee
Stormwater Fee Estimate Calculator
Estimate a monthly stormwater utility fee from impervious area and local rate.
Before you calculate
Use it before checking whether your city offers rain garden or barrel credits.
- Cities use different billing units.
- Credits are local and conditional.
- Measure roof and pavement separately.
Monthly fee$13.20Before any credit.
Credit estimate$2.64Potential monthly reduction.
After credit$10.56Planning estimate only.
1
Enter impervious square feet.
2
Use the local rate and unit size.
3
Test a possible credit percentage.
Example
A property with 2,400 sq ft of impervious area, a $5.50 rate per 1,000 sq ft, and a 20% credit screens at $13.20 before credit and $10.56 after credit.
Use your local bill
Cities use different units, rates, tiers, and credit rules. This page is a calculator for the math, not a substitute for the local schedule.
Credits usually require proof
Photos, drawings, receipts, maintenance plans, and inspections are common in stormwater credit programs.
Questions
Common checks.
Is every property charged this way?
No. Stormwater fee programs are local and differ widely.
Do rain barrels always earn credits?
Only if your local program includes them and your setup meets the requirements.