FEMA flood zones: AE, VE, X and D
Updated October 27, 2026
FEMA's flood insurance rate maps sort land into zones by how likely it is to flood. The zone decides whether your lender will require flood insurance and roughly what it costs. Here is what each letter means.
High-risk zones (Special Flood Hazard Areas)
These areas have at least a 1% chance of flooding in any year (the "100-year floodplain"), which is about a 26% chance over a 30-year mortgage. Flood insurance is required for mortgages from federally regulated or insured lenders.
| Zone | What it means |
|---|---|
| A | 1% annual chance; no detailed study, so no base flood elevation. |
| AE | 1% annual chance, with a base flood elevation (the height water is expected to reach). The most common high-risk zone. |
| AH / AO | 1% annual chance of shallow flooding (ponding, or sheet flow on slopes), usually 1 to 3 feet. |
| VE / V | Coastal high-hazard area: 1% annual chance plus waves of 3 feet or more. Strictest building rules. |
| Floodway | The channel and nearby land that must stay open to carry floodwater. Building and rebuilding there are tightly restricted. |
Moderate and minimal risk
| Zone | What it means |
|---|---|
| X (shaded), also B | Moderate risk: between the 1% and 0.2% annual chance floodplains (the "500-year floodplain"), or shallow 1% flooding under a foot. |
| X (unshaded), also C | Minimal risk: outside the 0.2% annual chance floodplain. |
| D | Possible but undetermined risk: the area hasn't been studied. |
Lenders don't require flood insurance in these zones, but they don't mean "never floods". Water from heavy rain, overwhelmed drains and flash flooding can reach homes far from any mapped floodplain, and policies in these zones are usually much cheaper than in high-risk ones.
Texas specifics
- The Texas seller's disclosure (Property Code section 5.008) asks whether the home is in a floodplain, has flooded, or has had a flood insurance claim or federal flood aid. Read those answers closely.
- Some Texas cities and counties publish newer flood maps than FEMA's effective map, often based on NOAA Atlas 14 rainfall. A home outside FEMA's floodplain can be inside the local one. HouseDirt checks these local and preliminary maps where they're published.
- New flood insurance policies through the NFIP usually take 30 days to start, unless the policy is bought in connection with a new mortgage.
What to ask
- Has the home ever flooded, or had a flood insurance claim? How much was paid?
- Is there an elevation certificate? What is the current flood insurance premium, and can the policy be transferred?
- Does the street or yard hold water in heavy rain?
Check a Texas home
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Common questions
- What does flood zone AE mean?
- Zone AE is a high-risk area (a Special Flood Hazard Area) with at least a 1% chance of flooding in any year, where FEMA has worked out a base flood elevation. Federally backed and federally regulated mortgages require flood insurance there.
- Is flood zone X safe?
- Zone X is moderate (shaded) or minimal (unshaded) risk on FEMA's map, and flood insurance isn't required by lenders. It isn't flood-free: homes outside the high-risk zones still flood, so ask about the home's history and price a policy anyway.
- What is a VE flood zone?
- Zone VE is a coastal high-hazard area: a 1% annual chance flood plus waves of 3 feet or more. Building rules there are the strictest, and flood insurance is required for federally backed mortgages.
- What is flood zone D?
- Zone D means the flood risk is possible but undetermined: FEMA hasn't studied the area. Lenders don't require flood insurance there, but insurers price it as unknown risk.
- What does a 1% annual chance flood mean over a mortgage?
- A 1% chance every year adds up to about a 26% chance of at least one such flood over a 30-year mortgage.
Sources
- FEMA, flood zones glossary
- FEMA Flood Map Service Center
- FEMA, National Flood Hazard Layer
- FloodSmart (National Flood Insurance Program)
- Texas Property Code, section 5.008 (seller's disclosure, including flood questions)
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