How to find a certified radon professional in Wisconsin
Anyone in Wisconsin can call themselves a radon contractor. Certification is voluntary, so it's on you to check. Here's how.
Wisconsin doesn’t require certification
The State of Wisconsin doesn’t require people doing radon testing or mitigation to be state licensed or nationally certified. DHS recommends choosing someone certified by one of the two EPA-recognized programs:
- The National Radon Proficiency Program (NRPP), searchable at nrpp.info
- The National Radon Safety Board (NRSB), searchable at nrsb.org
According to DHS, nearly 150 radon contractors across Wisconsin hold one of these certifications.
How to search
- Go to the NRPP or NRSB search page.
- Choose “Certified Measurement Specialist” for testing, or “Certified Mitigation Specialist” for installing a system.
- Enter your ZIP code and a search radius.
- Contact at least three of the results for estimates, as DHS recommends.
Filter carefully. Some people are certified for testing only, or mitigation only.
Other states do it differently
Some states run their own radon licensing. Pennsylvania, for example, requires radon testers and mitigators to be certified by its Department of Environmental Protection, and homeowners there check a state list. If you’re reading radon advice written for another state, keep that in mind. York PA Radon Pros explains how the Pennsylvania side works for homeowners around York.
In Wisconsin, stick with NRPP or NRSB.
Questions to ask before you hire
- Which person on the job holds the certification, and what’s the number?
- Will you check how air moves under the slab before picking a suction point?
- Where will the fan go, and where will the pipe discharge?
- How do you handle frost and condensation in an exterior pipe?
- What sealing is included?
- Who does the electrical for the fan?
- Is a post-mitigation test included, and who runs it?
- What warranty covers the fan and the system, in writing?
Get the answers in the written estimate. EPA’s Consumer’s Guide to Radon Reduction has a longer checklist.
Still have questions?
Your regional Radon Information Center can help, or call the state line at 1-888-LOW-RADON. If you haven’t tested yet, start with our radon testing guide. If you’re mid-sale, see radon when buying or selling. Or go back to the Wisconsin radon guide.
Hiring questions
Is NRPP better than NRSB?
Both are recognized by the EPA. NRPP is the larger program, which is why most certified radon professionals in Wisconsin hold NRPP certification.
Measurement or mitigation certification. Which do I need?
Measurement certification is for testing. Mitigation certification is for installing systems. Some people hold one and not the other, so filter your search for the service you need.
How many estimates should I get?
DHS recommends contacting at least three companies for a cost estimate before choosing.
- We don't sell tests or install systems
- Every figure links to its source
- Built on Wisconsin DHS and EPA guidance