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§ 4.1 — Montana

Radon testing in Montana

This page lists 22 people and firms with a current radon testing credential whose official record names Montana. Each row shows the credential number, the issuing body, and its own verification date. The latest record check on this page was October 13, 2026; other records may have been checked earlier. Source: the official file linked on each listing. Verify the number before you hire.

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

Radon testingRadon mitigation

Testing listings are people credentialed to measure radon. Mitigation listings are people credentialed to install a reduction system. Some people appear on both lists when the official file says they hold both. The list is ordered by the city or county on each record. That place is where the record is filed, not a promise about where the person works.

22 listings. Type to narrow the list.

  1. Ian J White

    Bozeman Radon & Mold

    current NRPP № 115726

    testing, Belgrade

    (406) 404-6835October 13, 2026cite ↗

  2. Jeffrey M Squire

    Bozeman Radon

    current NRPP № 115697

    testing, Belgrade

    (406) 404-6835October 13, 2026cite ↗

  3. Phillip R. Smith

    Cornerstone Transformations Inspection

    current NRSB № RMS-25MS052

    testing, Belgrade

    September 30, 2026cite ↗

  4. Caleb A Benson

    Radon Men

    current NRPP № 116223

    testing, Billings

    (406) 839-7294October 13, 2026cite ↗

  5. Hunter M Sherner

    Doctor Radon

    current NRPP № 114923

    testing, Billings

    (406) 591-6558October 13, 2026cite ↗

  6. Lance Story

    A-pro Radon And Property Services

    current NRPP № 113515

    testing, Billings

    (406) 561-7911October 13, 2026cite ↗

  7. Noah A Shaver

    Certified Radon Services

    current NRPP № 115788

    testing, Billings

    (406) 671-5151October 13, 2026cite ↗

  8. Rick Shaver

    Certified Radon Services

    current NRPP № 104379

    testing, Billings

    (406) 671-5151October 13, 2026cite ↗

  9. Zachary P Proffitt

    Billings Radon Pros

    current NRPP № 116104

    testing, Billings

    (503) 728-8035October 13, 2026cite ↗

  10. Cristilyn Watkins

    Yellowstone Radon

    current NRPP № 111883

    testing, Bozeman

    (406) 404-9523October 3, 2026cite ↗

  11. Jay Roberts

    Rocky Mountain Inspections

    current NRPP № 107127

    testing, Bozeman

    (406) 600-3989October 13, 2026cite ↗

  12. Mark A Gilbertson

    Truer Inspections

    current NRPP № 108412

    testing, Bozeman

    (406) 599-4396October 3, 2026cite ↗

  13. Joel B Beaudette

    Advanced Radon Mitigation & Contracting Specialists, Llc

    current NRPP № 111763

    testing, Corvallis

    (406) 544-9785October 3, 2026cite ↗

  14. Sean Murphy

    Murphy Radon

    current NRPP № 108159

    testing, Florence

    (406) 531-3860October 3, 2026cite ↗

  15. Bryan E Bostick

    Pro-duct Cleaning Services

    current NRPP № 115687

    testing, Glendive

    (406) 240-1851October 13, 2026cite ↗

  16. Clayton T Parsons

    Central Montana Home Inspections

    current NRPP № 115711

    testing, Great Falls

    (406) 750-1866October 13, 2026cite ↗

  17. Clinton J Culbert

    Capernaum Group Llc

    current NRPP № 115222

    testing, Great Falls

    (406) 781-9861October 13, 2026cite ↗

  18. Roger Martin

    Martin's Maintenance, Llc

    current NRPP № 108142

    testing, Great Falls

    (406) 799-0205October 3, 2026cite ↗

  19. Walter Widdis

    Indoor Air Solutions

    current NRPP № 115011

    testing, Laurel

    (406) 208-3796October 13, 2026cite ↗

  20. Jennifer L Thorne

    Safe Home Environmental, Llc

    current NRPP № 113525

    testing, Lolo

    (406) 961-9602October 13, 2026cite ↗

  21. Aleksey A Levchenko

    Missoula Radon Llc

    current NRPP № 115747

    testing, Missoula

    (406) 880-2630October 13, 2026cite ↗

  22. John Sullivan

    Pure Air Solutions

    current NRPP № 114930

    testing, Missoula

    (406) 312-7634October 13, 2026cite ↗
Fig. 4 — 22 of 22 listings have a mappable place. 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.

Appendix A

Questions before you hire

How do I verify a radon credential listed for Montana?

Open the source link on this page and match the name and credential number to the official file. Status can change after a record’s verification date. The latest record check on this page was October 13, 2026; check each record’s date. If the official page disagrees with this directory, trust the official page. We do not invent credential numbers.

Does EPA certify radon contractors?

The U.S. EPA does not certify radon contractors. EPA publishes guidance on finding a qualified radon service provider and points to state programs and national certifications. This directory is not affiliated with EPA. We do not display EPA-certified badges.

What does last verified mean on this page?

Last verified on an individual record is the date we checked its official source. The latest credential check on this page was October 13, 2026; other records may have earlier dates. We refresh the roster monthly. Current means the person appeared as currently credentialed on the source at that record’s verification date. Credentials can expire between refreshes, so follow the source link.

Appendix A.2

Before you hire

  1. Ask who holds the credential printed on this page, and ask them to show the same number. Some firms employ several credentialed people. The listing is the person or firm on the official file, not whoever answers the phone.
  2. Ask what test method or mitigation system they will use for this building. A credential is not a work plan. Testing and mitigation are separate services here, and a person appears on both lists only when the official file says they hold both.
  3. Ask how they will document test results or the finished mitigation system. Keep that document with the credential number you verified. This directory does not score jobs, publish reviews, or collect quotes.

The full checklist: Certified radon tester: what they do and how to hire one

Montana pages here use current NRPP or NRSB certifications. City pages use the city printed on that record, not a ZIP-radius search. A national certification is not a state license in Montana. Some states require a separate state credential to work legally. Read the methodology. Credential status can change.