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Radon professionals in Illinois

Who tests and fixes radon in Illinois, what Illinois's own program says about licensing, and how to check a credential before you hire.

Updated October 2, 2026

Short answer

Radon professionals in Illinois, in brief

Radon411 lists 373 radon businesses for Illinois: 287 listed for radon measurement (testing), 94 for mitigation, 8 of them for both and 2 laboratories. Illinois's radon program says the state licenses or certifies radon professionals.

Listed
373
Businesses on Illinois's list here
Testing
287
Listed for radon measurement
Mitigation
94
Listed for mitigation
Laboratories
2
Listed laboratories

The rule

Does Illinois license radon professionals?

Yes. Illinois's radon program page, checked on September 25, 2026, says:

The Agency also licenses and regulates the individuals who provide radon measurement and mitigation to the public.
IEMA-OHS Radon Program, read September 25, 2026

EPA's state contacts page lists Illinois among the states with radon credentialing programs. Licensing is done by the state, not by the national programs, and EPA requires states that receive radon grants to give the public a list of only those providers credentialed by the state or by NRPP or NRSB.

Listings for Illinois come from the list of licensed radon professionals that the Illinois Emergency Management Agency (IEMA) publishes, last read on September 25, 2026, and from businesses that confirm their own details through Radon411's claim process.

State program

Illinois's radon program

The state's own radon program: the place to ask who may work in the state.

IEMA-OHS Radon Program

Illinois Emergency Management Agency and Office of Homeland Security

Its page covers who may test and fix radon in the state and the disclosure rule for home sales.

Phone (800) 325-1245

Visit the program's page (opens in a new tab)Read September 25, 2026

The directory

Radon professionals listed for Illinois

Filter by service, open a city, or page through the list. Each card says which list it was read from.

By city

The 12 of 187 Illinois cities with the most listings. Search for any other.

373 professionals in Illinois. Showing 1 to 1224.

On this page: 5 mitigation, 719 testing

Mitigation (5)

Testing (719)

Show 12 more on this page

Located in Illinois, licensed by another state

These businesses have an address in Illinois, and another state's registry lists them. That does not mean Illinois licenses them: check with Illinois's radon program before hiring one for work here.

14 professionals located in Illinois and listed by another state. Showing 1 to 1214.

Show 2 more on this page

Nearby

Listed professionals in states next to Illinois

A business licensed in a neighboring state is licensed there, not necessarily in Illinois. Check Illinois's rule above before you hire one.

Before you hire

How to check a credential in Illinois

  1. Illinois's own list

    Start with the Illinois Emergency Management Agency (IEMA). Licensing is done by the state, so its list or search says who may legally work in Illinois.

  2. NRPP's search

    The National Radon Proficiency Program's search finds its Certified Mitigation Specialists and Certified Measurement Professionals by area, by name, or by the 6-digit NRPP ID number a professional can give you.

  3. NRSB's search

    The National Radon Safety Board's search finds a professional in your area, or confirms that a named professional is NRSB certified.

  4. The ID card

    The programs usually issue a photo ID card showing the holder's qualifications and its expiry date. Ask to see it, and if in doubt, check with the body that issued it.

Hiring

Hiring in Illinois

A tester

287 businesses are listed for testing here. Ask for the credential and ID card, how the test will be guarded against interference, and when the report will come. EPA recommends an independent, qualified tester for the test after a system is installed.

What a professional test involves

A mitigation contractor

94 businesses are listed for mitigation here. Get more than one estimate, contact references, and ask for a written proposal and a contract before any work starts.

How to choose a contractor

Questions

Common questions about Illinois

Does Illinois require radon professionals to be licensed?

Yes. Illinois's radon program page, checked on September 25, 2026, says.

EPA's state contacts page lists Illinois among the states with radon credentialing programs.

The Agency also licenses and regulates the individuals who provide radon measurement and mitigation to the public.
How do I find a certified radon mitigator in Illinois?

Radon411 lists 94 businesses for mitigation in Illinois, each with the source that lists it.

Your state radon program can help you find qualified professionals in the state, and NRPP and NRSB, the two national proficiency programs EPA names, each publish a search of the professionals they certify.

Mitigation listings for IllinoisHow to choose a mitigation contractor

Who tests for radon in Illinois?

Radon411 lists 287 businesses for radon measurement in Illinois.

A qualified radon tester is very often a home inspector, and your state radon office can give you its approved list of radon testing companies.

Testing listings for IllinoisWhat a professional radon test involves

Does Illinois have a radon disclosure rule for home sales?

IEMA-OHS Radon Program's page, checked on September 25, 2026, says:

Illinois Radon Awareness Act - This is the legislation that requires the seller to provide to the buyer of any interest in residential real property the IEMA-OHS pamphlet entitled "Radon Testing Guidelines for Real Estate Transactions" and the Illinois Disclosure of Information on Radon Hazards.

Every state's program, licensing and disclosure rule

How current are the Illinois listings?

Listings for Illinois come from the list of licensed radon professionals that the Illinois Emergency Management Agency (IEMA) publishes, last read on September 25, 2026, and from businesses that confirm their own details through Radon411's claim process.

Is every business on this page licensed in Illinois?

No listing here is a license. The first list holds businesses Illinois's own registry lists, or that confirmed their own listing; each card names its source.

14 businesses with an address in Illinois appear in a separate list because another state's registry lists them. That does not mean Illinois licenses them.

No business pays to be listed, labelled or placed higher here, and Radon411 sells no leads. How listings are verified. Run a radon business in Illinois? Claim your listing.

Next steps

Where to go next