Verified ranking · Updated June 2026
Best Radon Mitigation in Nashua, NH
How we rank (the Bedrock Standard). Every figure below is dated and sourced; star ratings change over time. We read five-star share together with review depth, so a near-perfect share on a large review base counts for more than a perfect score on a small one.
Leads the Nashua radon local pack with a perfect headline rating (5.0 across 98 Google reviews), a Nashua-based radon testing and mitigation specialist. We read its headline rating here; the full review breakdown was not available at publication, so weigh it against the deeper, fully verified record below.
The regional radon leader from Hooksett (4.9 across 304 Google reviews, NRPP-certified, more than 25 years), with a far deeper and fully verified review record. It serves Nashua and is the safer pick if you weight verified depth over a perfect score on a smaller base.
Also serving the area
A full-service foundation firm and National Radon Defense contractor (4.8 across 676) that also handles radon mitigation.
Handles radon mitigation in-house alongside waterproofing and foundation work (4.9 across 250); a local full-service option rather than a dedicated radon specialist.
Side-by-side
| Company | Type | Google (June 2026) | Named system | Published warranty | BBB |
|---|---|---|---|---|---|
| Airtight Radon Solutions | local independent | 5 / 98 | None | Not stated on its website; ask at quote. | Not assessed here |
| Advanced Radon Mitigation & Water Treatment | local independent | 4.9 / 304 | None | Not independently verified; ask at quote. | Not assessed here |
| Erickson Foundation Solutions | local national brand | 4.8 / 676 | Installs the national Basement Systems line (TripleSafe, SaniDry, WaterGuard) rather than a self-branded system | Transferable written warranty (duration not stated). | A+, accredited 2015, 2 complaints (3yr) |
| 603 Basement Solutions | local independent | 4.9 / 250 | Forever Dry System | Publishes a transferable "Dry for Life" guarantee (marketing wording; exact written terms pending). | A+, BBB accredited since 2022 |
Head-to-head comparisons
Other services in Nashua, NH
- Best Basement Waterproofing in Nashua, NH
- Best Foundation Repair in Nashua, NH
- Best Crawl Space Encapsulation in Nashua, NH
Data verified as of the dates shown; star ratings change over time. See our methodology.