Text Size
Increase text size
Increase text size

Colorado Radon Zones

This map was developed to assist 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 parts of the state. All homes should be tested regardless of geographic location. The map assigns each of the counties in the state 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.



Map displaying Colorado radon zones