Look up the FEMA flood zone for an address

Enter a US street address. We match it with the US Census geocoder and read FEMA’s National Flood Hazard Layer at that point.

A lookup is a map reading, not an official flood determination or an insurance quote.

How to check if a house is in a flood zone

To check a flood zone by address, find the property on FEMA’s National Flood Hazard Layer, the official digital version of the Flood Insurance Rate Map (FIRM). Zones beginning with A or V are Special Flood Hazard Areas: a 1% or greater chance of flooding each year, where federally regulated lenders must require flood insurance. Zone X is moderate or minimal hazard. Confirm the result on the FEMA Flood Map Service Center.

Key takeaways

  • A and V zones are high-risk Special Flood Hazard Areas; a federally backed or regulated mortgage there requires flood insurance (42 U.S.C. 4012a).
  • Zone X is not “no risk”: FEMA says about 40% of NFIP flood insurance claims come from outside high-risk zones.
  • A map lookup is a starting point. Your lender’s flood determination, an elevation certificate and an insurance quote decide the real cost.
  • Ask the seller about past flooding, claims and FEMA assistance; several states now require those answers on the disclosure form.
26%Chance of at least one flood over a 30-year mortgage in a high-risk zoneFEMA
~40%Share of NFIP claims from outside high-risk flood zonesFEMA, Aug 2025
$250kMaximum NFIP building coverage for a home44 CFR 61.6
30 daysUsual NFIP waiting period (a loan closing is an exception)42 U.S.C. 4013
Probability

Chance of at least one flood during a 30-year mortgage

Zone A / AE / V / VE (1% a year)
26%
Shaded Zone X (0.2% a year)
5.8%
2% a year (for comparison)
45%
Calculated as 1 − (1 − p)30, assuming the annual chance stays constant. FEMA describes high-risk areas as having “a 26% chance of flooding over the life of a 30-year mortgage.” FEMA.

What your lookup result means

V · VECoastal high hazard1% annual chance plus storm waves. Insurance required for regulated mortgages.
A · AE · AH · AOHigh risk (SFHA)1% annual chance. AE shows a base flood elevation. Insurance required.
Shaded XModerateBetween the 1% and 0.2% annual-chance floods. Insurance optional under federal law.
Unshaded XMinimalAbove the 0.2% annual-chance flood. Floods can still happen.

Read the full definitions, including A99, D and the floodway, in what each FEMA flood zone means.

Five checks after the flood-zone lookup

  1. Confirm the zone on the official map

    Open the FEMA Flood Map Service Center, search the address and note the FIRM panel number and effective date. Our lookup reads a copy of FEMA’s layer at a geocoded point; a lot near a zone boundary can differ.

    Keep: Panel number, zone and effective date.

  2. Check for pending or preliminary map changes

    The Map Service Center also lists preliminary and pending maps. Preliminary maps are for review only and cannot enforce insurance requirements, but they signal where the zone may change.

    Keep: Any pending map and its expected effective date.

  3. Ask for an elevation certificate

    In a high-risk zone, the building’s elevation relative to the base flood elevation strongly affects risk. Ask the seller or the local floodplain office whether an elevation certificate exists.

    Keep: Elevation certificate or a note that none exists.

  4. Ask the seller about flood history

    Ask about past water entry, flood insurance claims and FEMA assistance. Texas, New York, New Jersey and Florida disclosure rules include flood questions.

    Keep: Written answers and any claim documents.

  5. Get an insurance quote before your contingency ends

    Since Risk Rating 2.0, NFIP premiums reflect property-specific factors such as elevation, distance to water and rebuilding cost, not only the zone. FEMA.

    Keep: A written flood and homeowners quote.

Time-sensitive: Congress has authorized the National Flood Insurance Program through 11:59 p.m. on September 30, 2026. FEMA says that if authorization lapses it continues paying claims but would stop selling and renewing policies, which can delay closings that need flood insurance. Check FEMA’s reauthorization page for the current status.

Flood zone maps for major cities

Several cities publish their own flood viewers alongside FEMA’s map, sometimes with draft or future-conditions floodplains. Local guides:

Houston & Harris CountyLocal flood maps, map status and the questions to askNew York CityLocal flood maps, map status and the questions to askSan Antonio & Bexar CountyLocal flood maps, map status and the questions to askTampa & Hillsborough CountyLocal flood maps, map status and the questions to askMiami & Miami-Dade CountyLocal flood maps, map status and the questions to ask

Our lookup method and its limits

The lookup sends your address to the US Census Bureau geocoder, which places it along the street’s address range, then reads the flood-hazard polygon at that point from Esri’s ArcGIS Living Atlas copy of FEMA’s National Flood Hazard Layer (March 3, 2026 snapshot). That layer omits minimal-hazard Zone X and areas FEMA has not mapped, so a blank result means “no mapped high- or moderate-risk area here,” not “no risk.” We do not store the address you look up. This is not a Standard Flood Hazard Determination, which your lender orders.

Questions people ask

How do I find out what flood zone my house is in?

Search the address on the FEMA Flood Map Service Center or use the lookup above, which reads FEMA’s National Flood Hazard Layer. For a mortgage, your lender orders a flood zone determination that is the one used for the loan.

Is flood insurance required in Zone X?

Federal law does not require it outside the Special Flood Hazard Area, but a lender may still ask for it. Many claims come from outside high-risk zones, so it is worth a quote.

What does Zone AE mean?

Zone AE is a high-risk Special Flood Hazard Area with a 1% annual chance of flooding and a base flood elevation determined by FEMA. Regulated lenders require flood insurance there.

Can a flood zone change?

Yes. FEMA updates maps, and owners can request a Letter of Map Amendment (LOMA) if a structure on naturally high ground sits above the base flood elevation. FEMA: change your flood zone.

Is the lookup the same as a flood determination?

No. It is a map reading at a geocoded point. A lender’s Standard Flood Hazard Determination, an elevation certificate or a surveyor can give a property-specific answer.

PropertyDataCheck early access

Checking a home in or near a flood zone?

A pre-offer property check puts the flood zone next to the recorded ownership, liens, permits and disclosure questions for the address, so you know what to resolve before your contingency ends.

  • Parcel & owner of record matched
  • Liens, permits & flood zone in one place
  • Gaps turned into questions for your team

Any starting point is welcome. Continuing shares your entry with us. Privacy

Early access request. Reports are not available yet.

Sources & method

We start with the agency or statute that governs each rule and link to it directly. Figures carry their source and date. Rules and forms change; confirm the current version with the responsible office or a qualified professional.

  1. FEMA: Flood zones glossary
  2. FEMA Flood Map Service Center
  3. FEMA: National Flood Hazard Layer
  4. FEMA: Know your flood risk (26% over 30 years)
  5. FEMA blog: floods can happen anywhere (August 2025)
  6. 42 U.S.C. 4012a: mandatory flood insurance purchase
  7. 42 U.S.C. 4013: effective date of policies
  8. 44 CFR 61.6: coverage limits
  9. FEMA: Risk Rating 2.0
  10. FEMA: NFIP reauthorization
  11. FEMA: change your flood zone (LOMA/LOMR-F)
  12. US Census Bureau geocoder
  13. Esri Living Atlas: USA Flood Hazard Areas

Reviewed September 25, 2026 by the PropertyDataCheck editorial team. Corrections: info@propertydatacheck.com. How we research and update guides.