IOWA
The U.S. EPA and the U.S. Geological Survey have evaluated the radon
potential in the U.S. and have developed this map is 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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