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Radon in Illinois
Interactive Radon Map by County or Zip Code
Disclaimer and Purpose. This map is 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.
The data presented is taken from annual reports submitted by licensed measurement and mitigation professionals. The measurement data includes calendar years 2003 - 2019. The mitigation data includes calendar years 2005 - 2011. The measurement data includes only the highest measurement for each address that was submitted. Data collected from measurements performed by homeowners will be included in future updates of the website.
Measurements can be found by either County or Zip Code.
Looking for a measurement or mitigation professional? View our list of licensed professionals.