How do I find out if my land is in a flood zone?

NationwideReviewed October 2026

Search your address on the FEMA Flood Map Service Center, which FEMA calls the official public source for flood hazard information produced for the National Flood Insurance Program. It shows Flood Insurance Rate Maps and related products. Maps change over time, so confirm you are looking at the current effective version. Then call your county or city floodplain administrator; offices such as Guadalupe County will search by address or legal description for flood information and permits on file, and Polk County says its floodplain administrator makes the final determination. If the site is in or near a flood zone, plan for a surveyor's elevation certificate.

Check your local rule. This varies by state, county or city. Your permitting office has the final word; the official lookup pages below show you who that is.

Sources

Find the rule for your area

Official pages from the agencies and code bodies that set these rules.

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General information, written in our own words from the sources listed with each answer. It is not legal, engineering, tax or financial advice. Rules change and differ by state, county and city, so confirm with the office that issues your permit before you build. Last reviewed October 2026.