The 2014 Illinois Emergency Management Agency state that the above maps are NOT intended to be used to determine if a home in a given county or zip code should be tested for radon. Homes with elevated levels of radon have been found throughout the state of Illinois. All homes should be tested regardless of geographic location. (Illinois Emergency Management Agency. (2014). Radon Illinois. Radon in Illinois. Retrieved from
Are you planning a move or interested in learning about the radon levels in your home?
1. Considering a radon measurement?
IEMA recommends ALL homebuyers to have an indoor radon test performed prior to purchase and occupancy of a new home. Radon tests should be performed in the lowest structural areas of the home and if there is multiple foundation types; they all should be be tested.
2. Looking for neighborhood radon measurement testing data?
Explore the compiled data below to learn more about the radon concentrations in the zip codes within the counties of Northern Illinois. All cities have areas that test high for radon, even Chicago!
Radon test results by County :
3. Find your city below to learn:
- The number of buildings tested for radon in your County
- The total measurements that were above the State recommended action level of 4.0 pCi/L
- The County average by zip code
- The County percenty above 4.0 pCi/L
- A County radon mitiation map