What Is the Risk from Radon in Illinois?

  • As many as 1,160 Illinois citizens are at risk of developing radon-related lung cancer each year according to the Illinois Emergency Management Agency (IEMA) and EPA.
  • The average Illinois indoor air radon concentration is 5.1 pCi/L, above the EPA action level (Source: IEMA).
  • Approximately one in two homes tested in Illinois (45 percent of homes) have radon at or above the EPA action level of 4 pCi/L. (Source: IEMA).

You can see the estimated radon risk for each county on this interactive map.

Illinois Radon Hotline

Need more information on radon in Illinois? Call the Illinois Radon Hotline at 1-800-325-1245. Operating hours are 8:30 am (CST) through 4:30 pm (CST). If you are calling after standard operating hours, the automated messaging service will record your message and a staff member will return your call.

For a list of radon measurement and mitigation specialists please visit the Illinois Emergency Management Agency's website.

Illinois Radon Home Buyers Guide for Real Estate Transactions

The Radon Home Buyer’s Guide video, based on Illinois radon regulations and EPA’s Home Buyer’s guidance, is a short video designed to educate Home Buyer’s about radon risk in Illinois prior to home purchase. Watch video.

Illinois Radon Poster & Video Contests

The Illinois Radon Poster and Video Contests are made possible through a partnership with the U.S. Environmental Protection Agency and Illinois Emergency Management Agency.

Page last updated: November 21, 2022

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