§ 4.1 — New Hampshire

Radon mitigation in New Hampshire

This page lists 20 people and firms with a current radon mitigation credential whose official record names New Hampshire. 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 testing Radon 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.

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20 listings. Type to narrow the list.

Branden C Edwards
Precision Radon Systems, Llc
current NRPP № 114695
mitigation, Center Barnstead
(603) 267-0607October 13, 2026cite ↗
Joseph J. Zammit
Radon Clear Llc
current NRSB № RRS-8G0016
mitigation, Dover
September 30, 2026cite ↗
Robert J. Coletta Iii
Coletta Radon Systems & Water Treatment
current NRPP № 106343
mitigation, Goffstown
(603) 401-3563October 13, 2026cite ↗
Corey J. Buchan
Advanced Radon Mitigation & Water Treatment
current NRPP № 108000
mitigation, Hooksett
(603) 644-1207October 3, 2026cite ↗
Keith R. Vaillancourt
Advanced Radon Mitigation & Water Treatment
current NRPP № 109414
mitigation, Hooksett
(603) 644-1207October 3, 2026cite ↗
Ryan B Farley
Airflow Radon Pro Llc
current NRPP № 114716
mitigation, Hooksett
(978) 758-2953October 13, 2026cite ↗
Matthew A. Erickson, Jr.
Erickson Foundation Solutions
current NRPP № 108444
mitigation, Hudson
(603) 878-5552October 3, 2026cite ↗
Aaron Johnston
Allied Clearwater Llc
current NRPP № 108640
mitigation, Kingston
(603) 642-9901October 3, 2026cite ↗
Christopher Borst
Allied Clearwater Llc
current NRPP № 108686
mitigation, Kingston
(603) 642-9901October 3, 2026cite ↗
Michael Talotta
Northern Vista Home Inspection & Radon Mitigation, Llc
current NRPP № 105944
mitigation, Littleton
(802) 745-7020October 13, 2026cite ↗
Matthew J. Trombly
Draghi Environmental Services, Inc Dba Household E
current NRSB № RRS-4GSS0005
mitigation, Londonderry
September 30, 2026cite ↗
Dillon I Kingsbury
2k Radon & Basement Services
current NRPP № 113966
mitigation, Manchester
(603) 793-5607October 13, 2026cite ↗
Joseph D Martinez
Advanced Radon Mitigation
current NRPP № 115902
mitigation, Manchester
(603) 644-1207October 13, 2026cite ↗
Michael Gardner
Advanced Radon Mitigation & Water Treatment
current NRPP № 109829
mitigation, Manchester
(603) 644-1207October 3, 2026cite ↗
Eino A. Anttila
Black Dog Inspections, Llc
current NRPP № 103817
mitigation, Nashua
(603) 566-8176October 13, 2026cite ↗
Marcel Gamache
Airtight Radon Solutions
current NRPP № 114078
mitigation, Nashua
(508) 251-9455October 13, 2026cite ↗
Erik Fardy
Reliable Radon, Llc
current NRPP № 103528
mitigation, North Sutton
(603) 384-1114October 13, 2026cite ↗
Todd Scheffer
Srw Environmental Consulting, Llc
current NRPP № 107467
mitigation, Rochester
(603) 330-3537October 13, 2026cite ↗
Daniel Espinal
New England Radon, Ltd.
current NRPP № 100398
mitigation, Salem
(603) 893-4260October 13, 2026cite ↗
Alexander Widdison
Us Water Consultants, Inc.
current NRPP № 109076
mitigation, Windham
(603) 893-8833October 3, 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 New Hampshire?

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

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.
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.
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

New Hampshire 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 New Hampshire. Some states require a separate state credential to work legally. Read the methodology. Credential status can change.