Illinois radon resources

Who answers what in Illinois

Illinois Emergency Management Agency and Office of Homeland Security (IEMA-OHS), Radon Program

Licensing of radon measurement and mitigation professionals, current licence verification, the state radon pamphlet, and testing guidance.

Your county or municipal building department

Whether a permit is required for the slab penetration and the dedicated electrical circuit a mitigation system needs. This is a local question, not a state one.

Licensing and credentials

Illinois licenses radon measurement and mitigation professionals through IEMA-OHS under the Radon Industry Licensing Act. The licence is statewide, so a licensed contractor based in the Rock River Valley may work in the collar counties or downstate — the county line is irrelevant to who may quote your home. Measurement and mitigation are separate licences; holding one does not authorise the other.

What to verify before you hire

• Ask for the IEMA-OHS licence number as it appears on the contract, not a claim of being licensed.
• Confirm the licence is current, not merely once-held.
• Confirm it covers mitigation rather than measurement alone.
• Ask the same of whoever performs the post-mitigation verification test, which is a measurement activity.

Disclosure and transactions

The Illinois Radon Awareness Act requires sellers of residential property to provide the state radon pamphlet and to disclose known radon information. It does not require a seller to test or to mitigate. Illinois also places disclosure duties on residential landlords who know of a radon hazard, and a tenant may test at their own expense. The response to an elevated result in a sale is negotiated between the parties, like any other inspection finding.

Testing resources

Start with a short-term test on the lowest lived-in level under closed-building conditions. Much of northern Illinois sits in EPA Zone 1, the highest predicted category — which is a reason to test rather than a prediction about your address. IEMA-OHS publishes testing guidance and maintains listings of licensed professionals.

What this page deliberately does not state

We do not restate Illinois licence fees, renewal periods, application requirements, or listing contents, because those change and we cannot re-verify them from this environment. IEMA-OHS is the authoritative source for all of them.

Illinois markets and cities we cover

• Suburban Chicagoland — Naperville, Wheaton, Downers Grove, Glen Ellyn, Lombard, Aurora
• Rockford & the Rock River Valley — Rockford, Loves Park, Machesney Park, Belvidere, Roscoe, Rockton
• Peoria & the Illinois River Valley — Peoria, East Peoria, Pekin, Morton, Washington, Dunlap
• Springfield & the Capital Region — Springfield, Chatham, Sherman, Rochester, Riverton, Auburn
• Bloomington-Normal — Bloomington, Normal, Hudson, Towanda, Downs, LeRoy
• Champaign-Urbana — Champaign, Urbana, Savoy, Mahomet, Rantoul, St. Joseph
• Decatur & Macon County — Decatur, Forsyth, Mount Zion, Maroa, Warrensburg, Clinton
• Quad Cities (Illinois) — Moline, Rock Island, East Moline, Silvis, Milan, Coal Valley
• Kankakee County — Kankakee, Bourbonnais, Bradley, Manteno, Momence, Herscher
• DeKalb County — DeKalb, Sycamore, Genoa, Cortland, Kirkland, Waterman

More on Illinois

• For Illinois radon contractors — what we verify before routing a request, and how requests are matched.
• How RRNC reaches a house — Four steps between a provision existing and your house having one — and why none of them replaces a test.
• Who licenses radon work — State licence, state certification, or national credential — and what each means when you check a contractor.
• Licensing change mid-project — Open quote, scheduled install, or pending verification — how a regime change lands on each.
• All state resource centres — how the ten states we serve differ on licensing and disclosure.
• How state radon certification differs — the homeowner guide to what a credential actually means.