Radon is an odorless radioactive gas that results from the breakdown of uranium in soil, rock and water. You cannot see or smell radon, but it can become a health hazard when it accumulates indoors.  It can enter your home through cracks and openings in the foundation floor and walls.

The only way to know if you have high levels of radon is to test!

Educational Materials

• What is Radon?
• Indoor Air Quality Brochure [PDF]
• Radon Information for Homeowners/Buyers [PDF]
• Radon - Health Hazard (Environmental Protection Agency)
• List of Licensed Mitigation and Measurement Professionals for McHenry County

The McHenry County Department of Health sells short term (4-7 day) radon test kits.  The cost of the kit is $8 which includes the mailer and postage for processing the radon test.  Kits may be purchased at:

McHenry County Department of Health
Division of Environmental Health
667 Ware Rd Suite 110 (Administration Building)
Woodstock, IL 60098

For more information, call (815) 334-4585