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Flood Zone D: 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 D: Flood risk possible but not studied.
Flood insurance required? No federal requirement. Zone D is outside the Special Flood Hazard Area, so flood insurance is optional, though a lender can still ask for it.
What Zone D means
Zone D marks areas where flood hazards are possible but FEMA has not analysed them. It is common in remote, sparsely developed areas.
Undetermined is not the same as low. Without a study, nobody has measured how likely flooding is.
Flood claims from Zone D buildings
In FEMA’s National Flood Insurance Program claims for Florida, Illinois, Louisiana, New Jersey, New York, North Carolina and Texas, 1,676 claims (0% of claims with a recorded zone) came from buildings rated in Zone D, with $22.8M paid since 1978. 66 of them were for floods in 2015 or later. The typical (median) paid claim was $5K.
Counties with the most Zone D claims:
- Brazoria County, TX — 334 claims, $8.0M paid
- Calcasieu Parish, LA — 298 claims, $4.2M paid
- Pinellas County, FL — 159 claims, $1.5M paid
- Miami-Dade County, FL — 130 claims, $2.0M paid
- Sarasota County, FL — 89 claims, $607K paid
- Monroe County, FL — 67 claims, $1.4M paid
- Harris County, TX — 45 claims, $366K paid
- Taylor County, TX — 39 claims, $507K paid
The zone is the one the building was rated in when the claim was paid; maps change over time.
Building rules in Zone D
No federal floodplain building requirements apply, though local rules may.
Flood insurance in Zone D
No federal requirement. Zone D 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 D
- Ask neighbours and the county about past flooding, and look at the land: low ground, nearby washes and creeks.
- 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 D require flood insurance?
No federal requirement. Zone D is outside the Special Flood Hazard Area, so flood insurance is optional, though a lender can still ask for it.
What is flood zone D?
An area where flood risk has not been studied. Flooding is possible, but FEMA has not mapped how likely it is.
How do I find out if a house is in Zone D?
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 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.
- Zone X — Outside the high-risk floodplain. Shaded X is moderate risk; unshaded X is minimal.
- 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.