How to Check Your FEMA Flood Zone in Edwardsville, IL

Direct answer: Look up your address at the FEMA Flood Map Service Center (msc.fema.gov) or Madison County's GIS floodplain viewer to see your parcel's official flood zone. Being outside a mapped zone doesn't mean your basement is safe from water — FEMA maps track river and creek overflow, not the groundwater, clay-soil hydrostatic pressure, and grading problems that cause most wet basements here.

Three ways to look up your flood zone

Source	What you get
FEMA Map Service Center (msc.fema.gov)	Official current FIRM panel for your address, downloadable
Madison County GIS Viewer	Local map interface with parcel overlay and flood layer
Madison County Planning & Development	Staff determination if the map is ambiguous for your parcel

Effective maps change periodically — confirm you're viewing the current effective map, not a preliminary or superseded one.

What the zone label actually means

Zone X (unshaded) is minimal flood risk and no federal insurance mandate. Zone X (shaded) is moderate risk — inside the 500-year floodplain. Zone A or AE is a Special Flood Hazard Area with at least a 1% annual chance of flooding, which is where federally backed mortgages typically require flood insurance and where Madison County floodplain development rules apply most strictly to grading and drainage work.

If you're near a mapped creek, ditch, or low area anywhere in Madison County, it's worth checking even if the address doesn't feel like a flood risk — 2023's FEMA remap of the Metro East updated flood boundaries in several areas that hadn't changed since 2003, and some properties moved zones without anyone at the address knowing until they checked.

Why your zone doesn't predict your basement's risk

This is the part that trips people up: FEMA flood zones model river and creek overflow during a major storm event. They say nothing about the seasonal water table under your slab, the hydrostatic pressure clay soil puts against your foundation walls, or whether your downspouts dump water four feet from the house. A property comfortably outside any mapped flood zone can still have a chronically wet basement, and a property inside Zone AE can have a bone-dry one if the grading and drainage around it are handled correctly. Flood zone and wet-basement risk are related but separate questions — check both.

FEMA flood zones: questions

How do I check if my Edwardsville property is in a FEMA flood zone?

Use the FEMA Flood Map Service Center at msc.fema.gov, enter your address, and view the current effective Flood Insurance Rate Map (FIRM) for the parcel. Madison County's GIS portal and its Planning & Development floodplain page provide the same data with a local map interface.

What does it mean if my home is in a Special Flood Hazard Area?

A Special Flood Hazard Area (Zone A or AE on FEMA maps) has at least a 1% annual chance of flooding. Homes in these zones with a federally backed mortgage are typically required to carry flood insurance, and drainage or grading work on the property can be subject to Madison County floodplain development permit review.

Does being outside a mapped flood zone mean my basement can't flood?

No. FEMA flood zones map river and creek overflow risk, not groundwater, hydrostatic pressure, or surface drainage from grading and downspouts — which are the most common causes of a wet basement in this area regardless of flood zone designation.

What we check on site, regardless of flood zone

Grading and downspout discharge first — the cheapest fix that solves the most common cause.
Soil type and drainage history at the specific parcel, not a zone-wide assumption.
Whether your parcel's floodplain status changes what's required for the fix, before it's quoted.
A written diagnosis before a product recommendation, every time.