FEMA flood Zone AH
High-risk (SFHA) · Special Flood Hazard Area · annual chance 1% (100-year)
Zone AH is a high-risk (sfha) FEMA flood-map designation. Areas subject to inundation by 1-percent-annual-chance shallow flooding (usually areas of ponding) where average depths are between one and three feet. Base Flood Elevations derived from detailed analyses are shown. AH is a Special Flood Hazard Area. Because it is a Special Flood Hazard Area, flood insurance is mandatory for a building with a federally backed mortgage.
Source: FEMA — Flood Zones glossary & FIRM zone definitions. Data as of June 2026.
Zone AH at a glance
| Attribute | Zone AH |
|---|---|
| Risk category | High-risk (SFHA) |
| Special Flood Hazard Area (SFHA)? | Yes — high-risk |
| Flood insurance mandatory (federal mortgage)? | Yes, in the SFHA |
| Annual flood chance | 1% (100-year) |
| Base Flood Elevations (BFEs) shown? | Yes |
Source: FEMA — Flood Zones glossary & FIRM zone definitions. Data as of June 2026.
What Zone AH means for your flood insurance
Flood insurance is mandatory for federally backed mortgages. Shallow ponding flooding generally causes less catastrophic damage than riverine or coastal flooding.
Under Risk Rating 2.0, FEMA prices each property on its own flood risk — distance to water, flood type, foundation, the height of the lowest floor and rebuild cost — rather than charging one flat rate per zone. So the zone tells you whether insurance is mandatory and roughly how risky the area is, while your actual premium is property-specific. See the cost estimator for a rough figure.
States where Zone AH is common
Zone AH is among the dominant mapped flood zones in these states:
How Zone AH compares with other flood zones
| Zone | Category | SFHA? | Insurance mandatory? | Annual chance |
|---|---|---|---|---|
| Zone AH | High-risk (SFHA) | Yes | Yes | 1% (100-year) |
| Zone A | High-risk (SFHA) | Yes | Yes | 1% (100-year) |
| Zone AE | High-risk (SFHA) | Yes | Yes | 1% (100-year) |
| Zone AO | High-risk (SFHA) | Yes | Yes | 1% (100-year) |
| Zone AR | High-risk (SFHA) | Yes | Yes | 1% (temporarily increased) |
| Zone A99 | High-risk (SFHA) | Yes | Yes | 1% (100-year) |
| Zone V | High-risk coastal (SFHA) | Yes | Yes | 1% (100-year) + wave action |
Frequently asked questions
What does FEMA flood Zone AH mean?
Areas subject to inundation by 1-percent-annual-chance shallow flooding (usually areas of ponding) where average depths are between one and three feet. Base Flood Elevations derived from detailed analyses are shown. AH is a Special Flood Hazard Area.
Is flood insurance required in Zone AH?
Yes. Zone AH is a high-risk Special Flood Hazard Area, so federal law requires flood insurance for buildings with a mortgage from a federally regulated or insured lender. Flood insurance is mandatory for federally backed mortgages. Shallow ponding flooding generally causes less catastrophic damage than riverine or coastal flooding.
Is Zone AH a high-risk flood zone?
Yes. Zone AH is a Special Flood Hazard Area (SFHA) with at least a 1% (100-year) chance of flooding. SFHAs are the zones FEMA treats as high-risk for insurance and floodplain-management purposes.
How does Zone AH affect my flood insurance premium?
Since FEMA's Risk Rating 2.0, premiums are based on each property's specific characteristics rather than the zone alone, but the zone still signals risk. Flood insurance is mandatory for federally backed mortgages. Shallow ponding flooding generally causes less catastrophic damage than riverine or coastal flooding. Use our calculator for a rough estimate and get a real quote from an NFIP agent.
Keep exploring
Source
Definitions: FEMA — Flood Zones glossary & FIRM zone definitions (US public domain). This is general information, not insurance advice — confirm your property's zone on the official FEMA Flood Map Service Center and verify insurance requirements with your lender or agent. See our disclaimer.
Last updated: 2026-06-20