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Flood Zone X: 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

What Zone X means

Zone X is everything outside the Special Flood Hazard Area on a modern FEMA map. It comes in two flavours: shaded X (formerly Zone B) — the 0.2% annual chance "500-year" floodplain, areas with 1% chance flooding less than a foot deep, or areas protected by accredited levees — and unshaded X (formerly Zone C), with minimal mapped risk.

FEMA’s data shows Zone X is far from flood-free: across the states we cover, about a quarter of NFIP flood insurance claims with a recorded zone came from buildings in X, B or C zones, often from heavy rain overwhelming drainage.

Flood claims from Zone X buildings

In FEMA’s National Flood Insurance Program claims for Florida, Illinois, Louisiana, New Jersey, New York, North Carolina and Texas, 297,632 claims (16% of claims with a recorded zone) came from buildings rated in Zone X, with $11.62B paid since 1984. 123,815 of them were for floods in 2015 or later. The typical (median) paid claim was $21K.

Counties with the most Zone X claims:

• Harris County, TX — 72,531 claims, $3.84B paid
• Jefferson Parish, LA — 19,541 claims, $287.0M paid
• Nassau County, NY — 11,538 claims, $517.5M paid
• Orleans Parish, LA — 10,483 claims, $370.1M paid
• Galveston County, TX — 8,949 claims, $425.5M paid
• Jefferson County, TX — 6,805 claims, $355.3M paid
• Brazoria County, TX — 5,571 claims, $166.5M paid
• Suffolk County, NY — 5,175 claims, $120.8M paid

The zone is the one the building was rated in when the claim was paid; maps change over time.

Building rules in Zone X

There are no federal floodplain building requirements in Zone X, though some communities regulate the shaded 0.2% area.

Flood insurance in Zone X

No federal requirement. Zone X 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 X

• Look at the claim history for the ZIP code, not just the zone. A house near the edge of an A zone, or in a low street, can flood in a heavy rain.
• Policies in Zone X are usually much cheaper than in A or V zones, and some lenders still ask for one.
• 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

Other flood zones

• Zone B — The older name for shaded Zone X: moderate flood risk.
• 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.