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Flood Zone AH: What It Means and Whether You Need Flood Insurance

Updated October 2026 · FEMA definitions and NFIP claims for Florida, Illinois, Louisiana, New Jersey, New York, North Carolina and Texas

What Zone AH means

Zone AH marks low spots where floodwater collects and ponds, typically 1 to 3 feet deep, with at least a 1% annual chance of flooding. Think of depressions, bowls behind roads and railroads, or flat areas with poor drainage.

The map shows a base flood elevation for the ponding area. Old maps sometimes label a variant as AHB; we count those claims with AH.

Flood claims from Zone AH buildings

In FEMA’s National Flood Insurance Program claims for Florida, Illinois, Louisiana, New Jersey, New York, North Carolina and Texas, 42,360 claims (2% of claims with a recorded zone) came from buildings rated in Zone AH, with $699.9M paid since 1979. 9,083 of them were for floods in 2015 or later. The typical (median) paid claim was $5K.

Counties with the most Zone AH claims:

• Miami-Dade County, FL — 18,325 claims, $225.0M paid
• Broward County, FL — 14,710 claims, $143.8M paid
• Jefferson County, TX — 1,598 claims, $194.0M paid
• St. Charles Parish, LA — 1,390 claims, $38.1M paid
• Collier County, FL — 675 claims, $11.7M paid
• Cameron County, TX — 583 claims, $12.2M paid
• St. Clair County, IL — 457 claims, $2.5M paid
• Cook County, IL — 431 claims, $1.1M paid

The zone is the one the building was rated in when the claim was paid; maps change over time.

Building rules in Zone AH

New construction must be elevated to or above the BFE, and the site must have adequate drainage paths to guide water around buildings.

Flood insurance in Zone AH

Yes, for most buyers. Zone AH is a Special Flood Hazard Area, so a mortgage from a federally regulated or insured lender — including FHA, VA, USDA, Fannie Mae and Freddie Mac loans — requires flood insurance on the building.

Since FEMA’s Risk Rating 2.0 took effect in 2021–2022, NFIP premiums are priced for each building — elevation, distance to water, rebuilding cost and past claims — rather than by zone alone. The zone still decides whether insurance is mandatory. NFIP covers up to $250,000 for a home and $100,000 for contents, and new policies usually take 30 days to start, so do not wait for a storm forecast. Lenders must also accept qualifying private flood policies.

If you are buying or own a home in Zone AH

• Water in AH zones can sit for days — ask how long the street stayed flooded in past storms, not just how deep it got.
• Ask the seller for the flood disclosure and whether the house has ever had a flood claim — many states require it.
• Check the flood claim history for the ZIP code and county, not only the zone.

Check an address or ZIP code

Our free flood check shows FEMA’s flood zone for an address and how many flood claims were paid nearby. Or search a county or ZIP:

Common questions

Other flood zones

• Zone AE — High risk, with a mapped base flood elevation (BFE).
• Zone A — High risk, mapped by approximate methods — no BFE on the map.
• Zone A1–A30 — The older name for AE: high risk, with a BFE.
• Zone AO — High risk of shallow sheet flow on slopes, usually 1–3 ft deep.
• Zone A99 — High risk, to be protected by a federal flood-control system still being built.
• Zone AR — High risk, behind a decertified levee that is being restored.
• Zone VE — Coastal high risk with storm waves of 3 ft or more; BFE on the map.
• Zone X — Outside the high-risk floodplain. Shaded X is moderate risk; unshaded X is minimal.
• All FEMA flood zones explained

General information, not insurance, legal or real-estate advice. Sources: FEMA flood zone definitions and the NFIP Redacted Claims data set. Confirm the zone for a specific property with FEMA or your local floodplain manager.