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Free Flood Zone API

Free, no-auth JSON API for looking up FEMA flood zones. Returns zone designation, risk level, SFHA status, and base flood elevation for any U.S. coordinates.

Lookup by Coordinates

GET https://floodzonemap.org/api/lookup?lat=25.7617&lon=-80.1918

Parameters:

lat — Latitude (required)
lon — Longitude (required)

Response:

{
  "lat": 25.7617,
  "lon": -80.1918,
  "zone_count": 1,
  "zones": [
    {
      "zone": "AE",
      "zone_subtype": "FLOODWAY",
      "sfha": true,
      "base_flood_elevation": "6",
      "dfirm_id": "12086C",
      "risk_level": "High Risk",
      "risk_description": "1% annual chance flood..."
    }
  ],
  "web_url": "https://floodzonemap.org/lookup/25.761700,..."
}

Lookup by Address (for Embeds)

GET https://floodzonemap.org/api/embed?q=123+Main+St,+Miami,+FL

Geocodes the address and returns flood zone data plus the matched address and coordinates. CORS-enabled for use from any domain.

Usage

No API key required
CORS enabled — works from any domain
Rate limit: be reasonable (a few requests per second)
Data source: FEMA National Flood Hazard Layer (NFHL)
Attribution appreciated: link back to FloodZoneMap.org

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