Flood & Storms
What's the flood risk where you live?
Enter a ZIP code — and your street address for a precise answer — to see your FEMA flood zone on a map, whether proposed maps change it, your ZIP's flood history, and what to do next.
About this data and its limits
- Flood zones come from FEMA's National Flood Hazard Layer — the official, effective flood maps. A zone describes the mapped chance of flooding, not a guarantee either way.
- A ZIP code isn't a map area. We use the Census Bureau's ZIP Code Tabulation Area, which approximates it; PO-box-only ZIPs have none. Most ZIPs contain several zones, so only a street address gives one answer.
- Addresses are placed by the Census Geocoder, which estimates a spot along the block, or by OpenStreetMap when the Census can't match them. Near a zone line, confirm on FEMA's official map.
- "Has my zone changed?" compares the effective map with FEMA's preliminary and pending maps. FEMA has no preliminary maps for Houston yet: Harris County's MAAPnext drafts aren't published as open data, so we link to them instead of reading them.
- Flood history counts FEMA's anonymized flood-insurance claims by ZIP — only insured losses appear, so real flooding was more widespread.
- Insurance information is educational only — not insurance or legal advice.