Radon in Illinois

Radon Prevalence

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

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
 KEY:   Blue – Zone 1 – High potential       Yellow – Zone 2 – Moderate       Green – Zone 3 – Low potential
Note: 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.

Radon Legislation

Respiratory Health Association is active in advocating for awareness of radon and stricter regulations on radon in Illinois. Current radon-related legislation in Illinois is listed below.

Child Care Act – Radon Testing

Effective January 1, 2013, licensed day care centers, licensed day care homes, and licensed group day care homes are required to be tested for radon at least once every 3 years. Beginning January 1, 2014, child care centers will need to show proof the facility has been tested for radon within the last three years as part of the initial application or license renewal process. Learn more on the Illinois Emergency Management Agency's website or by viewing our What You Need to Know sheet "Radon Testing in Daycare Centers."

Tenant Radon Protection Act

Effective January 1, 2012, this act requires that, before a lease is signed, landlords provide tenants on or below the third floor with any records or reports of radon hazards. It also requires that landlords give IEMA's radon guide, a radon disclosure form and any radon test results to prospective tenants.

Illinois Residential Building Code Act

Amended in August 2012 and effective immediately, the Illinois Residential Building Code Act provides that a contract to build a home must contain a provision requiring a radon mitigation system be included in the construction.

Illinois Radon Awareness Act 2008

This act requires people who are selling their homes in Illinois to disclose results of radon testing and provide homebuyers with radon information.

School radon testing bill

This bill requires that every school building in Illinois is tested for radon every five years. School districts must notify parents and faculty of test results.

For more information, contact Amy O'Rourke:
Email Amy
(312) 628-0217