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Radon professionals in Wisconsin

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

Updated October 2, 2026

Short answer

Radon professionals in Wisconsin, in brief

No business that Wisconsin itself licenses or certifies is listed on Radon411 yet. Wisconsin's radon program says the state does not license or certify radon professionals.

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

The rule

Does Wisconsin license radon professionals?

No. Wisconsin's radon program page, checked on September 25, 2026, says:

The State of Wisconsin does not require contractors performing radon measurement or mitigation work to be state licensed or nationally certified.
Wisconsin Department of Health Services, read September 25, 2026

Wisconsin is not on the list of states with radon credentialing programs that EPA's state contacts page publishes. 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.

Radon411 reads no licensing list for Wisconsin; Wisconsin's radon program is the place to ask who works there.

State program

Wisconsin's radon program

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

Wisconsin Department of Health Services

Its page covers free or discounted test kits and who may test and fix radon in the state.

Phone 1-888-569-7236 · Email DHSRadon@dhs.wisconsin.gov

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

The directory

Radon professionals listed for Wisconsin

None that Wisconsin licenses yet. The businesses below have an address here and another state licenses them.

By city

8 cities in Wisconsin with a listed business address.

No business licensed by Wisconsin is listed here yet. Where Wisconsin licenses radon professionals, its own list is the complete one.

Located in Wisconsin, licensed by another state

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

13 professionals located in Wisconsin and listed by another state. Showing 1 to 1213.

On this page: 10 mitigation, 23 testing

Mitigation (10)

Testing (23)

Show 1 more on this page

Nearby

Listed professionals in states next to Wisconsin

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

Before you hire

How to check a credential in Wisconsin

  1. Wisconsin's rule

    Wisconsin's radon program says the state does not license radon professionals, so ask for a national certification instead, and check it in the next two steps.

  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 Wisconsin

A tester

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

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 Wisconsin

Does Wisconsin require radon professionals to be licensed?

No. Wisconsin's radon program page, checked on September 25, 2026, says.

Wisconsin is not on the list of states with radon credentialing programs that EPA's state contacts page publishes.

The State of Wisconsin does not require contractors performing radon measurement or mitigation work to be state licensed or nationally certified.
How do I find a certified radon mitigator in Wisconsin?

No business is listed for mitigation in Wisconsin on Radon411 yet.

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.

How to choose a mitigation contractor

Who tests for radon in Wisconsin?

No business is listed for radon measurement in Wisconsin on Radon411 yet.

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.

What a professional radon test involves

Does Wisconsin offer free or discounted radon test kits?

Wisconsin Department of Health Services's page, checked on September 25, 2026, says:

We recommend starting with your regional Radon Information Center since many centers provide test kits for free or reduced cost, and often with laboratory fees covered.

Free and discounted test kits by state

How current are the Wisconsin listings?

Radon411 reads no licensing list for Wisconsin; Wisconsin's radon program is the place to ask who works there.

Is every business on this page licensed in Wisconsin?

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

13 businesses with an address in Wisconsin appear in a separate list because another state's registry lists them. That does not mean Wisconsin 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 Wisconsin? Claim your listing.

Next steps

Where to go next