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The U.S. EPA and the U.S. Geological Survey have
evaluated the radon potential in the U.S. and have developed this map to
assist National, State, and local organizations to target their
resources and to assist building code officials in deciding whether
radon-resistant features are applicable in new construction. 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. The map assigns each of the 3,141 counties in the U.S. to one
of three zones based on radon potential. Each zone designation reflects
the average short-term radon measurement that can be expected to be
measured in a building without the implementation of radon control
methods. The radon zone designation of the highest priority is Zone 1.
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Zone 1 |
Highest Potential (greater than
4 pCi/L) |
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Zone 2 |
Moderate Potential (from 2 to 4
pCi/L) |
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Zone 3 |
Low Potential (less than 2
pCi/L) |
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