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Radon Mitigation in Madison

Updated October 2026 · 6 public sources cited

Wisconsin has no radon license law, so the burden of checking a contractor falls on you. Here's the process Wisconsin DHS recommends for Madison-area homeowners.

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By tapping “Get my free referral,” I agree that Radon Help Network may send my request to one local radon mitigation company serving Madison, and that this one company may call and text me about my request at the mobile number I entered, including with an autodialer, prerecorded or artificial (AI-generated) voices, and automated texts. Consent is not a condition of any purchase; to get help without agreeing, use our contact form. Msg & data rates may apply; message frequency varies. Reply STOP to opt out. Privacy Policy · Terms

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No state license, so check the national one

Wisconsin DHS says the state doesn't require contractors doing radon measurement or mitigation to be state licensed or nationally certified.1 Instead, it recommends hiring someone certified by one of the two EPA-recognized credentialing bodies: the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB). DHS counts nearly 150 NRPP- or NRSB-certified radon contractors working across Wisconsin.1

So, unlike Minnesota or Indiana, there's no state database to check. The national certification is the closest thing to a license, and confirming it is up to you.

DHS's steps to find someone

  1. Search a national directory.Use the "find a professional" tool on the NRPP or NRSB website.2
  2. Pick the right credential.Choose "Certified Mitigation Specialist" for a system install. "Certified Measurement Specialist" is for testing only, and some pros hold one but not the other.1
  3. Search by ZIP.Enter your Madison-area ZIP and a radius.2
  4. Get three estimates.DHS recommends contacting at least three companies.2
  5. Confirm the certificate is active in that organization's database before you sign.1

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What the system does

DHS describes the standard approach: a pipe through the foundation pulls radon from the soil underneath and a fan vents it outside. In newer buildings with piping already in place, a contractor may only need to add a fan.3 DHS says mitigation systems can bring radon below 2 pCi/L, and that sub-slab depressurization isn't a do-it-yourself job unless you have considerable contractor skills.2

Get these in writing

Renting in Madison?

DHS publishes a radon guide for tenants and points renters and landlords to Wisconsin's landlord-tenant rules on habitability.3 With so many renters near campus, it's worth raising a high result with your landlord in writing.

After installation

Retest between 24 hours and 30 days after the fan starts, ideally with an independent tester, then at least every two years, per National Radon Program Services.5

Areas we serve

We match homeowners across the Madison area, including these communities and ZIP codes:

ZIP codes are 2020 Census ZIP Code Tabulation Areas, which closely approximate USPS ZIP codes. We list ZIPs that make up a substantial share of each community, so edge ZIPs that barely touch a town are left out, and some ZIPs span two towns.6 Not on the list? Send the form anyway, and we'll tell you if we can help.

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The home is

By tapping “Get my free referral,” I agree that Radon Help Network may send my request to one local radon mitigation company serving Madison, and that this one company may call and text me about my request at the mobile number I entered, including with an autodialer, prerecorded or artificial (AI-generated) voices, and automated texts. Consent is not a condition of any purchase; to get help without agreeing, use our contact form. Msg & data rates may apply; message frequency varies. Reply STOP to opt out. Privacy Policy · Terms

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Common questions

Do radon contractors need a license in Wisconsin?

No. Wisconsin DHS says the state doesn't require radon contractors to be state licensed or nationally certified. It recommends hiring someone certified by NRPP or NRSB.

How do I find a certified radon mitigator in Madison?

DHS says to use the find-a-professional search on the NRPP or NRSB website, choose Certified Mitigation Specialist, enter your ZIP, and get at least three estimates.

How low can a radon system get my levels?

Wisconsin DHS says mitigation systems can reduce radon to below 2 pCi/L.

Can I install a radon system myself?

DHS says sub-slab depressurization isn't a do-it-yourself project unless you have considerable contractor skills.

How many radon contractors are certified in Wisconsin?

DHS says nearly 150 radon contractors in Wisconsin are certified with NRPP or NRSB.

More for Madison

Other cities

Please note: Wisconsin doesn't license radon contractors, and the state health department recommends NRPP or NRSB national certification. This page is general information summarized from public agencies, not professional advice. For advice about your home, talk with a nationally certified radon professional.

Sources

  1. Wisconsin DHS, "Radon: How to Find a Contractor"
  2. Wisconsin DHS, "Radon Mitigation"
  3. Wisconsin Department of Health Services (DHS), "Radon Information for Wisconsin"
  4. U.S. EPA, "Consumer's Guide to Radon Reduction: How to Fix Your Home" (2010)
  5. National Radon Program Services (Kansas State University, EPA-funded), "Installing Mitigation"
  6. U.S. Census Bureau, 2020 ZCTA-to-place and ZCTA-to-county-subdivision relationship files
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