Radon zone maps are used to determine the potential for radon gas in a particular area. The maps are based on data collected by the Environmental Protection Agency (EPA) and can be used by homeowners, builders, and others to determine the potential risk of radon exposure in a given location.

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The EPA has divided the United States into three radon zones based on the potential for elevated levels of radon gas:

1. Zone 1: Counties with predicted average indoor radon screening levels greater than 4 pCi/L (picocuries per liter).
2. Zone 2: Counties with predicted average indoor radon screening levels between 2 and 4 pCi/L.
3. Zone 3: Counties with predicted average indoor radon screening levels less than 2 pCi/L.

Keep in mind that even if your area is in a lower risk zone, it is still possible to have elevated levels of radon in your home. Therefore, it's recommended that all homes get a professional radon test.