Radon in Idaho

Homes with elevated levels of radon have been found in Idaho in all three zones. All homes should be tested regardless of their geographic location. Important points to note:

All users of this map should carefully review the map documentation for information on within-county variations in radon potential and supplement the map with locally available information before making any decisions.

These maps are not to be used in lieu of testing during real estate transactions. Click on the maps to view radon zones in Idaho by county from Idaho Radon and the EPA.

The Map was developed (by the EPA) using 5 Factors to determine radon potential: indoor radon measurements; soil permeability; geology; foundation type; and aerial radioactivity. Radon potential assessment is based upon known geologic provinces. Geologic Provinces were adapted to county boundaries for the Map of Radon Zones. View the EPA radon map here.

Sections 307 and 309 of the Indoor Radon Abatement Act of 1988 (IRAA) directed the EPA to list and identify areas of the U.S. that have the potential for elevated indoor radon levels. Thie EPA's Map of Radon Zones assigns each of the 3,141 counties in the U.S. to one of three zones based on radon their individual potential.

Idaho Radon Testing Results Map Idaho Radon has performed various radon tests throughout Idaho and Oregon. Click on the map to the left to view this information.

View information about the risk of lung cancer from radon exposure.