Guides / Flood zone X

What does flood zone X mean?

Zone X is outside FEMA's high-risk Special Flood Hazard Area. Shaded X is moderate risk: the 0.2% annual-chance floodplain, sometimes called the 500-year floodplain, or a 1% annual-chance area with shallow flooding or protection from a levee. Unshaded X is minimal mapped risk. Federal law does not require flood insurance in Zone X, but a lender can still require it. FloodSmart reports that from 2014 to 2024, 29% of NFIP flood-insurance claims came from outside current high-risk areas.

Shaded and unshaded Zone X

On a Flood Insurance Rate Map, shaded Zone X is usually drawn with a pattern. Unshaded Zone X is the rest of the map outside the high-risk and moderate-risk areas. The panel legend is the way to tell them apart. A ZIP can contain both. FEMA's Zone X glossary describes shaded X as moderate flood hazard and unshaded X as minimal flood hazard.

Older maps used Zones B and C

On older paper maps, Zone B matches today's shaded Zone X and Zone C matches unshaded Zone X. If a survey or listing still says B or C, read it as moderate or minimal mapped risk, then confirm the current panel. See the zone codes hub.

Is flood zone X bad?

The mapped risk is lower than in a Special Flood Hazard Area. That is not the same as no risk. Shaded X still includes the 0.2% annual-chance flood and some levee-protected or shallow-flooding areas. Unshaded X is the lowest mapped category FEMA uses for this purpose, and it can still flood. The useful question is what the current map shows for the parcel, not a label for the neighborhood.

Insurance in Zone X

The mandatory purchase requirement applies in high-risk zones, which start with A or V, when the mortgage is federally backed or federally regulated. It does not apply in Zone X. A lender may still ask for a policy. NFIP coverage can be sold in participating communities for Zone X properties. FEMA's Risk Rating 2.0 prices a policy from property-specific factors rather than from the zone letter alone. This page does not quote a premium.

How to check a property

Look up the address at the FEMA Flood Map Service Center. For a ZIP-level start, use the free flood zone lookup. A lender's flood determination is the official answer for a mortgage.

How Zone X shows up in a Consilium Compare report

A report shows the share of each ZIP's land area in high-risk, moderate, and minimal mapped zones. Zone X can sit in the moderate share, the minimal share, or both. The bar is ZIP overlap, not a determination for one house. See the sample neighborhood report.

FAQ

Does flood zone X require flood insurance?

Federal rules do not require flood insurance in Zone X. A lender can still require it. FloodSmart reports that from 2014 to 2024, 29% of NFIP claims came from outside high-risk flood areas.

Is flood zone X bad?

Zone X is a lower mapped risk, not a promise of no flooding. Shaded X is moderate risk. Unshaded X is minimal mapped risk. Homes in both can flood.

What is the difference between shaded and unshaded zone X?

Shaded Zone X is the 0.2% annual-chance floodplain, or a 1% annual-chance area with shallow flooding or levee protection. Unshaded Zone X is mapped as minimal flood hazard, outside that 0.2% area.

Can a property in zone X flood?

Yes. Zone X means the map shows moderate or minimal hazard, not that flooding cannot happen. Check the address on FEMA's Flood Map Service Center.