Radon Testing CompaniesWisconsin file — NRPP / NRSB
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Chapter 04 — The Wisconsin file

Radon testing & mitigation in Wisconsin

This site imports no Wisconsin state roster, so these are current NRPP and NRSB certifications from those programs’ public finders. A national certification is not a state license. We group people by the city on that file. We do not invent neighborhoods. Source: NRPP.

Latest credential check October 13, 2026. Methodology Individual record dates may be earlier.

128current listings
64testing
64mitigation
Fig. 4 — 128 of 128 current listings are mapped. Each pin is a current listing at the Census city or county centroid on the file, approximate. Pins that share a place are spread so you can click them. Not street addresses.

§ 4.1

Cities with listings

A city appears only when at least one current listing serves it.

§ 4.3

How to verify a radon credential in Wisconsin

We have not established a Wisconsin radon credential. WI DHS says: "The State of Wisconsin does not require professionals conducting radon testing or mitigation services to hold a license or certificate of proficiency." (read 2026-09-08). We publish that as their statement rather than as our own finding, because a programme can be created at any session and this page is checked monthly, not daily. Listings here are current NRPP or NRSB certifications, which are national and are not a state license.

What Wisconsin says · NRPP finder · NRSB finder · All fifty states · reviewed September 8, 2026

§ 4.4

Questions about radon credentials in Wisconsin

Does Wisconsin license radon testers and mitigators?

We have not established a Wisconsin radon credential. The state's own radon page says: "The State of Wisconsin does not require professionals conducting radon testing or mitigation services to hold a license or certificate of proficiency." We read that on September 8, 2026 and publish it as their statement rather than as our finding, because a requirement can be created at any legislative session. Ask the Wisconsin radon program if you need today's position.

How do I verify a radon credential in Wisconsin?

The 128 listings shown here are current NRPP or NRSB certifications, verifiable on those programs' public finders. The latest record check was October 13, 2026; check each listing for its own date. To ask Wisconsin directly, contact 888-569-7236. If Wisconsin does require something we have not found, the agency is the place that will know.

Is an NRPP or NRSB certification enough in Wisconsin?

A national certification is never a state license anywhere. For Wisconsin we have not established that a state credential exists, and the state's radon page says otherwise in the words quoted above. Treat NRPP or NRSB as evidence of training, and ask the Wisconsin radon program what else applies.