Radon in Illinois


According to the U.S. EPA, one in every 15 homes in the United States have radon levels that exceed the recommended radon action level. In Illinois between 2003 and 2007, 42% of homes tested for radon gas had levels above the EPA radon action level.

Illinois Radon Zones
Blue – Zone 1 – High potential
Yellow – Zone 2 – Moderate
Green – Zone 3 – Low potential 
This map is not intended to determine if a home in a given zone should be tested for radon.  Homes with elevated radon have been found in all three zones. All homes should be tested regardless of geographic location.  It is recommended that homes are tested every two years.
 

 

The following data was compiled by the Illinois Emergency Management Agency (IEMA) Radon Program for homes tested between 2003 and 2007:

  • Cook County. 0.4% of homes were tested for radon, and 25.5% of the tested homes had radon levels above the US EPA action level. 
  • DuPage County. 4.4% of homes were tested, and 39.5% of the tested homes had high radon levels.
  • Kane County. 5.2% of homes were tested, and 43.6% of the tested homes had high radon levels.
  • Kendall County. 7.5% of homes were tested, and 45.9% of the tested homes had high radon levels.
  • Lake County. 14.8% of homes were tested, and 30.9% of the tested homes had high radon levels.
  • Will County. 4.1% of homes were tested, and 41.1% of the tested homes had high radon levels