Guides

How to check if a property is in a FEMA flood zone

Search the address in FEMA's Flood Map Service Center (msc.fema.gov) or the National Flood Hazard Layer viewer. Zones starting with A or V (A, AE, AH, AO, VE) are the Special Flood Hazard Area, the 1 percent annual chance or "100-year" floodplain. Shaded X is the 0.2 percent ("500-year") area, unshaded X is minimal hazard, and D means not studied.

Step by step

1. Go to FEMA's Flood Map Service Center and search the address.
2. Open the dynamic map (National Flood Hazard Layer) to see zone boundaries over the parcel, or view the effective FIRM panel.
3. Note the zone, the Base Flood Elevation (BFE) if shown, the panel number and its effective date.
4. Check for Letters of Map Change (LOMA/LOMR) on the parcel, and for preliminary maps that may replace the effective ones.

What the zones mean

Zone	Meaning
A, AE, AH, AO	Special Flood Hazard Area: 1% annual chance flood. AE has a BFE; A doesn't.
V, VE	Coastal high hazard area with wave action. Strictest rules.
X (shaded)	0.2% annual chance flood, or 1% with depths under 1 ft.
X (unshaded)	Minimal flood hazard.
D	Possible but undetermined hazard; not studied.

For site design

• A line on a map isn't a line on the ground. Near the boundary, the actual ground elevation versus the BFE decides, which needs a survey (an Elevation Certificate).
• Local floodplain codes are often stricter than FEMA minimums: fill limits, freeboard, compensatory storage.
• Unmapped doesn't mean dry. Small streams and local drainage problems often aren't on FIRMs.

Everything here is planning-level public data. Confirm boundaries, topography, wetlands and flood status with a licensed surveyor and the right specialists before design decisions depend on them.

Related

• How to check a property for wetlands
• How to find soil data for a site
• How to make a site base plan from an address

Updated October 2026.