This map is to assist National, State, and local organizations to target their resources and to implement radon-resistant building codes. It is noted that all homes should be tested for radon regardless of location. Fix your home if you have a radon level of 4 pCi/L or more.

You can test your home yourself or hire a radon testing professional.

Yellow –  counties have a predicted average indoor radon screening level greater than 2 pCi/L

Orange – counties have a predicted average indoor radon screening level between 2 and 4 pCi/L

Red – counties have a predicted average indoor radon screening level greater than 3 pCi/L