Flood · Glossary
FEMA Zone AE
Updated 2026-07-18
FEMA Zone AE is a Special Flood Hazard Area with a 1% annual chance of flooding and published base flood elevations. California development in Zone AE commonly requires local floodplain review and elevation or floodproofing measures under applicable rules.
What it means
Zone AE identifies a studied floodplain where FEMA has calculated base flood elevations. It replaced many older A1–A30 designations.
Why it matters for land decisions
The designation may affect buildable elevation, foundation design, insurance, and lender requirements.
- Locate the floodway if mapped.
- Confirm the governing elevation datum.
People also ask
Is flood insurance required in Zone AE?
A federally regulated or insured lender generally requires flood insurance for a building securing a loan in the SFHA, subject to federal rules and the lender's determination.
Can land in Zone AE be developed?
Often yes, but local ordinances may require elevation, anchoring, drainage, and no-rise or floodway analysis. Verify with the local floodplain administrator.
Official sources
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