Impact Fee Map
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Depends on state and local authority

Stormwater and drainage fee

A charge tied to added impervious surface and the downstream capacity it consumes.

Who charges it

The city, county or a drainage district

The trap

On-site detention you build yourself is usually creditable against this fee. Ask before you pay.

Drainage fees track impervious surface, so site design decisions move this number directly.

On-site detention and retention you build yourself is usually creditable, since it is an in-kind contribution of the same facility type. Nearly every act requires that credit.

Idaho allows an unusually long holding period for drainage and wastewater fees, up to twenty years, compared with eight for most categories.

Where this is authorized

Among the states with a general enabling act, 24 list this facility type as eligible and 5 do not. States without an act are a local question entirely.

Listed as eligible

ArizonaArkansasCaliforniaColoradoFloridaGeorgiaHawaiiIdahoIndianaMaineMontanaNevadaNew HampshireNew JerseyNew MexicoOklahomaOregonRhode IslandSouth CarolinaTexasUtahVermontWest VirginiaWisconsin

Not on the eligible list

DelawareIllinoisPennsylvaniaVirginiaWashington

Next

Get the actual numberSix steps from parcel record to a written estimate. Check your stateWhat is authorized where you are building. Credits and offsetsWhere this fee can legally come down.
Read this before you rely on anything here. Impact Fee Map describes who is legally allowed to charge new construction, for what, and what a fee payer's rights are under state law. It does not publish fee amounts for any city, county or district, and it never will, because no source keeps thirty-nine thousand local schedules current and a stale number is worse than none. This is not legal advice, not a fee quote and not a substitute for the adopted fee schedule of the bodies with jurisdiction over your parcel. Statutes change; verify against the current text and confirm every figure in writing with the agency that will bill you.