4.9 (357 Google reviews)
State Licensed IL Measurement
Radon Pros in Illinois
183 contractorsEPA zone context: Most of northern and central Illinois is Zone 1. The Chicago metro and surrounding suburbs are among the highest-risk areas.
About Radon in Illinois
Last updated: March 2026
Illinois has a well-documented radon problem concentrated in the northern and central regions of the state. According to EPA mapping, most of the Chicago metropolitan area and surrounding collar counties are Zone 1 — the highest risk classification. Cook, DuPage, Lake, Will, Kane, and McHenry counties all have elevated average indoor radon levels driven by glacial soil deposits and limestone bedrock. Illinois was one of the first states to establish mandatory licensing for radon professionals, reflecting the severity of its radon problem. The Illinois Emergency Management Agency (IEMA) requires all radon mitigators and testers to pass state examinations and maintain active licenses. In real estate transactions, Illinois requires sellers to disclose known radon hazards under state law. Testing is not mandated but is standard practice in Chicagoland transactions — most buyers' agents in the collar counties treat it as essential due diligence. Illinois is distinctive because of the concentration of radon risk in its most densely populated region. While southern Illinois has lower average levels, the northern two-thirds of the state where the vast majority of the population lives is solidly Zone 1. The EPA recommends all Illinois homes north of I-70 be tested regardless of age or construction type.
Typical Mitigation Cost in Illinois
$1,200–$2,800
Above national average
- • IEMA requires licensed radon professionals
- • Glacial drift soils in northern Illinois have variable permeability
- • Chicago metro labor rates significantly higher than downstate
- • Limestone bedrock in southern Illinois channels radon through fractures
State Licensed
State Licensed
State Licensed IL Measurement
5.0 (1 Google reviews)
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Data provided by Google Maps
Popular Cities for Radon Mitigation in Illinois
Radon mitigation in Chicago, Illinois15 local contractors listedRadon mitigation in Naperville, Illinois5 local contractors listedRadon mitigation in Rockford, Illinois5 local contractors listedRadon mitigation in Bolingbrook, Illinois4 local contractors listedRadon mitigation in plainfield, Illinois4 local contractors listedRadon mitigation in Downers Grove, Illinois3 local contractors listedRadon mitigation in Highland Park, Illinois3 local contractors listedRadon mitigation in Orland Park, Illinois3 local contractors listedRadon mitigation in Oswego, Illinois3 local contractors listedRadon mitigation in Tinley Park, Illinois3 local contractors listed
Other areas with radon contractors
Metro Areas in Illinois
What to Do Next
Three steps to address radon in your Illinois home.
Frequently Asked Questions: Radon in Illinois
Testimonials
Recent homeowner results in Illinois
Examples of homeowners who tested, mitigated, and confirmed lower radon levels in Illinois.
“Radon levels were 8.2 pCi/L before the install and 0.6 on the follow-up test. The quote matched the scope and the crew finished in one day.”
Outcome
Reduced from 8.2 pCi/L to 0.6 pCi/L
Rachel M.
Chicago, IL
“We compared two certified companies here and picked the one that explained the crawlspace plan clearly. Our monitor stayed below 1.5 the week after the system went live.”
Outcome
Post-install readings stayed below 1.5 pCi/L
Chris D.
Naperville, IL
“The site helped us find a contractor fast during escrow. They tested, installed mitigation, and documented the re-test so closing stayed on schedule.”
Outcome
Testing, mitigation, and re-test completed before closing
Patricia L.
Rockford, IL
Radon Guides for Illinois
Articles and guides to help you understand radon risk and make informed decisions.
What Does Radon Mitigation Cost? A Homeowner's GuideRadon Levels by State: Where Is Radon Most Common?What Radon Level Is Dangerous?How to Choose a Radon Mitigation Contractor
Cornerstone Guides
Radon testing & monitoring products for Illinois
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State Resources for Illinois
Radon mitigation cost in Illinois
Estimate likely project pricing by foundation type and system complexity.
Radon testing guide for Illinois homes
Learn when and how to test, plus how to interpret pCi/L results.
Radon levels and EPA zones in Illinois
See how state-level risk varies and what zone maps can and cannot tell you.
ZIP-level radon risk in Illinois
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All radon guides
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Radon mitigation near me
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Radon products for Illinois homeowners
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