French Drain Permit Requirements in Madison County, IL

Direct answer: Whether a French drain needs a Madison County permit depends on where the water exits your property, not on the trench itself. An interior drain tied to an existing sump discharging inside your own yard is usually permit-exempt. An exterior drain that changes grading, crosses a right-of-way, or discharges into a storm sewer or floodplain overlay generally needs sign-off from Madison County Planning & Development or your municipality's building department before work starts.

Why the discharge point is what actually gets regulated

Local drainage rules exist to stop one property's water problem from becoming the neighbor's. A trench and pipe under your own lawn, dumping to a dry well or a dedicated discharge area entirely on your property, rarely triggers review. The moment that same pipe crosses a lot line, ties into a public storm sewer, or discharges to a street or ditch in the right-of-way, it becomes county or municipal business — because now it's shared infrastructure, not a private fix.

Madison County's floodplain overlay adds a second layer. If your parcel sits inside a FEMA-mapped Special Flood Hazard Area, grading and drainage work can require a floodplain development permit on top of any standard building permit, even for work that would otherwise be exempt outside the zone.

French drain permit posture by project type

Project	Typical posture	Why
Interior drain to existing sump	Usually exempt	No change outside the foundation
Exterior drain, discharge stays on lot	Often exempt, confirm locally	Grading change, no shared infrastructure
Discharge to storm sewer or right-of-way	Permit required	Ties into public infrastructure
Work inside a mapped floodplain	Floodplain development permit required	County floodplain ordinance applies

General guidance, not a legal determination. Confirm with Madison County Planning & Development or your municipality before digging.

How to check before you dig

Two calls handle most of it: your municipal building department (or Madison County Planning & Development if you're unincorporated) for a standard permit determination, and JULIE — Illinois' one-call utility locate service — before any excavation, which is required by state law regardless of permit status. If your address is anywhere near a mapped creek, ditch, or drainage way, check the FEMA flood map for your parcel first; it changes what else applies.

A contractor who has pulled permits in Madison County before should know this without a phone call. If a quote doesn't mention discharge point or permit status at all, that's a sign the plan hasn't been thought through past the trench.

French drain permits: questions

Do I need a permit to install a French drain in Madison County?

An interior perimeter drain tied to an existing sump usually does not require a permit because nothing changes outside the foundation. An exterior drain that discharges to the street, a ditch, or a neighboring property, or that alters grading in a floodplain overlay, typically does — check with Madison County Planning & Development or your municipality's building department before digging.

Where does French drain runoff legally have to go in Edwardsville?

Discharge has to reach a legal point — a storm sewer, a drainage easement, or your own property line at a rate that does not dump concentrated flow onto a neighbor's lot. Directing water onto an adjacent property is a common source of neighbor disputes and, in some cases, a code violation regardless of permit status.

Is Edwardsville in a FEMA floodplain that affects drainage permits?

Parts of Madison County fall inside FEMA-mapped Special Flood Hazard Areas, and grading or drainage work inside those zones can trigger floodplain development permit review in addition to a standard building permit. Check your parcel against the current FEMA map before assuming a standard permit is the only one that applies.

What we confirm before anyone digs

Discharge point identified and checked against permit status before the quote is finalized, not after.
JULIE utility locate requested before any excavation — no exceptions, no shortcuts.
Floodplain status checked against the current FEMA map when the address is near mapped water.
If a permit is required, that timeline and cost is disclosed as its own line, not buried in the total.