FEMA flood Zone A
High-risk (SFHA) · Special Flood Hazard Area · annual chance 1% (100-year)
Zone A is a high-risk (sfha) FEMA flood-map designation. Areas subject to inundation by the 1-percent-annual-chance flood event (the base flood). Because detailed hydraulic analyses have not been performed, no Base Flood Elevations (BFEs) or flood depths are shown. Zone A is a Special Flood Hazard Area (SFHA). 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 A at a glance
| Attribute | Zone A |
|---|---|
| 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? | No |
Source: FEMA — Flood Zones glossary & FIRM zone definitions. Data as of June 2026.
What Zone A means for your flood insurance
Flood insurance is mandatory for buildings with a federally backed mortgage. Without a BFE, lenders and insurers use elevation data and Risk Rating 2.0 property characteristics to price coverage.
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 A is common
Zone A is among the dominant mapped flood zones in these states:
Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho
How Zone A compares with other flood zones
| Zone | Category | SFHA? | Insurance mandatory? | Annual chance |
|---|---|---|---|---|
| Zone A | High-risk (SFHA) | Yes | Yes | 1% (100-year) |
| Zone AE | High-risk (SFHA) | Yes | Yes | 1% (100-year) |
| Zone AH | 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 A mean?
Areas subject to inundation by the 1-percent-annual-chance flood event (the base flood). Because detailed hydraulic analyses have not been performed, no Base Flood Elevations (BFEs) or flood depths are shown. Zone A is a Special Flood Hazard Area (SFHA).
Is flood insurance required in Zone A?
Yes. Zone A 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 buildings with a federally backed mortgage. Without a BFE, lenders and insurers use elevation data and Risk Rating 2.0 property characteristics to price coverage.
Is Zone A a high-risk flood zone?
Yes. Zone A 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 A 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 buildings with a federally backed mortgage. Without a BFE, lenders and insurers use elevation data and Risk Rating 2.0 property characteristics to price coverage. 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