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Map of United States and Individual State Radon Zones

The purpose of this map is to assist National, State and local organizations to target their resources and to implement radon-resistant building codes. This map is not intended to be used to determine if a home in a given zone should be tested for radon. Homes with elevated levels of radon have been found in all three zones. All homes should be tested regardless of geographic location.

Map of United States Radon Zones - source EPA

MAP DEVELOPMENT: The Map was developed using five factors to determine radon potential: indoor radon measurements; geology; aerial radioactivity; soil permeability; and, foundation type. Radon potential assessment is based on geologic provinces. Radon Index Matrix is the quantitative assessment of radon potential. Confidence Index Matrix shows the quantity and quality of the data used to assess radon potential. Geologic Provinces were adapted to county boundaries for the Map of Radon Zones.

EPA State-by-State Radon Maps

You can view your State's map by clicking on your State below.

Alabama || Alaska || Arizona || Arkansas || California || Colorado || Connecticut || Delaware || Florida || Georgia || Hawaii || Idaho || Illinois || Indiana || Iowa || Kansas || Kentucky || Louisiana || Maine || Maryland || Massachusetts || Michigan || Minnesota || Mississippi || Missouri || Montana || Nebraska || Nevada || New Hampshire || New Jersey || New Mexico || New York || North Carolina || North Dakota || Ohio || Oklahoma || Oregon || Pennsylvania || Rhode Island || South Carolina || South Dakota || Tennessee || Texas || Utah || Vermont || Virginia || Washington || West Virginia || Wisconsin || Wyoming

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