Radon Testing CompaniesMontana file — NRPP / NRSB
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Chapter 04 — The Montana file

Radon testing & mitigation in Montana

This site imports no Montana 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.

42current listings
22testing
20mitigation
Fig. 4 — 42 of 42 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 Montana

We have not established a Montana radon credential. MT DEQ says: "Montana DEQ does not certify or require proof of certification for the contractors listed." (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 Montana says · NRPP finder · NRSB finder · All fifty states · reviewed September 8, 2026

§ 4.4

Questions about radon credentials in Montana

Does Montana license radon testers and mitigators?

We have not established a Montana radon credential. The state's own radon page says: "Montana DEQ does not certify or require proof of certification for the contractors listed." 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 Montana radon program if you need today's position.

How do I verify a radon credential in Montana?

The 42 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 Montana directly, contact 800-546-0483. If Montana does require something we have not found, the agency is the place that will know.

Is an NRPP or NRSB certification enough in Montana?

A national certification is never a state license anywhere. For Montana 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 Montana radon program what else applies.