Radon Testing CompaniesNew Hampshire file — NRPP / NRSB
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Chapter 04 — The New Hampshire file

Radon testing & mitigation in New Hampshire

This site imports no New Hampshire 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 September 14, 2026. Methodology Individual record dates may be earlier.

31current listings
17testing
14mitigation
Fig. 4 — 30 of 31 current listings are mapped. 1 record has an in-state place but no verified city or county coordinate. 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 New Hampshire

New Hampshire issues no radon credential of its own. RSA 310-A:189-a requires design and installation of airborne radon mitigation devices to be carried out by someone listed with the National Radon Proficiency Program or the National Radon Safety Board, so that national listing is the radon credential New Hampshire law names. This covers the radon requirement only; contractor licensing, business registration, and local permits are separate and are not covered here.

RSA 310-A:189-a · NRPP finder · NRSB finder · All fifty states · reviewed September 8, 2026

§ 4.4

Questions about radon credentials in New Hampshire

Does New Hampshire license radon testers and mitigators?

New Hampshire issues no radon credential of its own. Instead RSA 310-A:189-a requires design and installation of airborne radon mitigation devices to be carried out by someone listed with the National Radon Proficiency Program or the National Radon Safety Board. There is no state agency roster to check, because the state issues nothing to list.

How do I verify a radon credential in New Hampshire?

Check the person's listing on the NRPP or NRSB public finder, because that national listing is what RSA 310-A:189-a requires. The New Hampshire radon program can be reached at 603-271-2152. Match the name and the certification number on the program's own page before you hire.

Is an NRPP or NRSB certification enough in New Hampshire?

For the radon requirement itself, yes: RSA 310-A:189-a names an NRPP or NRSB listing as what New Hampshire law requires for design and installation of airborne radon mitigation devices, and the state issues no separate credential. That covers the radon rule only. Contractor licensing, business registration, and local permits are separate requirements that this site does not track.