Guide
How to Verify a Radon Tester's Illinois License
Updated
Illinois law (the Radon Industry Licensing Act, 420 ILCS 44/) requires anyone who performs radon measurement or mitigation in the state to hold a license issued by the Illinois Emergency Management Agency (IEMA). IEMA publishes a free public lookup to verify a specific person or company's license before hiring them.
What the license actually requires
To hold an Illinois radon professional or technician license, an applicant has to complete an IEMA-approved radon measurement and mitigation training course, pass the state licensing exam for the relevant specialty (measurement or mitigation), document experience in radon work, and carry general liability insurance. Licenses require ongoing continuing education to renew, administered under 32 Illinois Administrative Code Part 422, the rule that implements the Licensing Act.
Why it exists
Before the Licensing Act, nothing stopped an untrained person from selling radon testing or mitigation services in Illinois. The licensing requirement exists so a homeowner has a baseline guarantee that whoever is testing or fixing their home has passed a real exam and carries insurance, not just a claim of experience.
How to actually check a license
IEMA's Radon Licensing Portal (public.iema.state.il.us/Radon) maintains the state's list of active licensees, and the Illinois.gov "Radon Licensed Professionals List" service links directly to it. Checking before booking takes a couple of minutes and costs nothing.
Quick answers
FAQ
Does the license requirement apply to measurement, mitigation, or both?
Both, as separate license types. A radon contractor under Illinois law is someone licensed to perform radon mitigation, radon measurement, or both, and the exams differ by specialty.
Is a license required for someone testing their own home with a DIY kit?
The licensing requirement is aimed at people and companies performing radon services for others commercially, not a homeowner testing their own house for personal knowledge with a retail kit.
What happens if an unlicensed person performs radon work in Illinois?
IEMA can investigate unlicensed activity, and a licensed contractor found in violation of the Act can have their license terminated. The law also prohibits interfering with a licensed measurement or mitigation in progress.
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