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Flood Zone B: 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
Zone B: The older name for shaded Zone X: moderate flood risk.
Flood insurance required? No federal requirement. Zone B is outside the Special Flood Hazard Area, so flood insurance is optional, though a lender can still ask for it.
What Zone B means
Zone B appears on Flood Insurance Rate Maps from before the mid-1980s. It marks moderate-risk land between the 1% and 0.2% annual chance floodplains — what newer maps show as shaded Zone X.
If a claim or policy lists Zone B, the building was rated on an old map. The current map may put it in a different zone.
Flood claims from Zone B buildings
In FEMA’s National Flood Insurance Program claims for Florida, Illinois, Louisiana, New Jersey, New York, North Carolina and Texas, 79,620 claims (4% of claims with a recorded zone) came from buildings rated in Zone B, with $3.13B paid since 1978. 8,136 of them were for floods in 2015 or later. The typical (median) paid claim was $15K.
Counties with the most Zone B claims:
- Orleans Parish, LA — 16,695 claims, $612.1M paid
- Jefferson Parish, LA — 9,571 claims, $157.1M paid
- St. Bernard Parish, LA — 6,072 claims, $715.2M paid
- Jefferson County, TX — 5,932 claims, $372.9M paid
- Galveston County, TX — 2,998 claims, $100.2M paid
- Orange County, TX — 2,593 claims, $224.4M paid
- Palm Beach County, FL — 2,359 claims, $11.8M paid
- Nassau County, NY — 1,891 claims, $69.6M paid
The zone is the one the building was rated in when the claim was paid; maps change over time.
Building rules in Zone B
No federal floodplain building requirements apply.
Flood insurance in Zone B
No federal requirement. Zone B is outside the Special Flood Hazard Area, so flood insurance is optional, though a lender can still ask for it.
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 B
- Confirm the current zone on FEMA’s Map Service Center; old B areas are sometimes remapped into AE after new studies.
- 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
Does flood zone B require flood insurance?
No federal requirement. Zone B is outside the Special Flood Hazard Area, so flood insurance is optional, though a lender can still ask for it.
Is flood zone B high risk?
No. It is moderate risk — outside the 1% annual chance floodplain but inside the 0.2% one.
How do I find out if a house is in Zone B?
Search the address on the FEMA Flood Map Service Center, or use the free flood check on ZipFactbook, which reads FEMA’s current flood map for the address and adds the local claim history.
Other flood zones
- Zone X — Outside the high-risk floodplain. Shaded X is moderate risk; unshaded X is minimal.
- Zone C — The older name for unshaded Zone X: minimal mapped flood risk.
- Zone AE — High risk, with a mapped base flood elevation (BFE).
- Zone VE — Coastal high risk with storm waves of 3 ft or more; BFE on the map.
- 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.