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§ 4.1 — Montana

Radon mitigation in Montana

This page lists 20 people and firms with a current radon mitigation 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.

20 listings. Type to narrow the list.

  1. Jordan A Watts

    Watts Radon (radon Remediation Llc)

    current NRPP № 116043

    mitigation, Anaconda

    (360) 333-4252October 13, 2026cite ↗

  2. Ian J White

    Bozeman Radon & Mold

    current NRPP № 115691

    mitigation, Belgrade

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

  3. Jeffrey M Squire

    Bozeman Radon

    current NRPP № 115725

    mitigation, Belgrade

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

  4. Caleb Benson

    Radon Men, Llc

    current NRSB № RRS-26RS013

    mitigation, Billings

    406-839-7294September 30, 2026cite ↗

  5. Hunter M Sherner

    Doctor Radon

    current NRPP № 115211

    mitigation, Billings

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

  6. Lance Story

    A-pro Radon And Property Services

    current NRPP № 114056

    mitigation, Billings

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

  7. Noah A Shaver

    Certified Radon Services

    current NRPP № 116273

    mitigation, Billings

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

  8. Rick Shaver

    Certified Radon Services

    current NRPP № 104380

    mitigation, Billings

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

  9. Zachary P Proffitt

    Billings Radon Pros

    current NRPP № 116255

    mitigation, Billings

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

  10. William Watkins

    Yellowstone Radon Llc

    current NRPP № 113593

    mitigation, Bozeman

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

  11. Joel B Beaudette

    Advanced Radon Mitigation & Contracting Specialists, Llc

    current NRPP № 111822

    mitigation, Corvallis

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

  12. Sean Murphy

    Murphy Radon

    current NRPP № 108160

    mitigation, Florence

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

  13. Roger Martin

    Martin's Maintenance, Llc

    current NRPP № 108143

    mitigation, Great Falls

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

  14. Neil Hawks

    Hawks Construction Llc

    current NRPP № 115008

    mitigation, Helena

    +14066030800October 13, 2026cite ↗

  15. Jay W. Gorder

    House Detectives, Inc.

    current NRPP № 108026

    mitigation, Kalispell

    (406) 756-3636October 13, 2026cite ↗

  16. Cody Perin

    Flathead Valley Radon

    current NRPP № 111477

    mitigation, Lakeside

    (406) 570-5796October 3, 2026cite ↗

  17. Walter Widdis

    Indoor Air Solutions

    current NRPP № 115081

    mitigation, Laurel

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

  18. Jennifer L Thorne

    Safe Home Environmental, Llc

    current NRPP № 113692

    mitigation, Lolo

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

  19. John Sullivan

    Pure Air Solutions

    current NRPP № 114876

    mitigation, Missoula

    (406) 312-7634October 13, 2026cite ↗

  20. Joe A Engibous

    Big Mountain Insulators, Inc.

    current NRPP № 113964

    mitigation, Whitefish

    (406) 261-7846October 13, 2026cite ↗
Fig. 4 — 20 of 20 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: How to choose a radon mitigation company: 6 checks before you sign

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.