Verified ranking
Best Radon Mitigation in Manchester, 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.
An NRPP-certified Radon Mitigation Specialist (cert no. 113966-RMS) that is also BBB A+ accredited and backs its work with a transferable warranty, handling radon in-house alongside the waterproofing and foundation work it most often accompanies (4.9 across 250 Google reviews, 97.6 percent five-star on its dated breakdown). It leads on our composite standard: the radon certification plus accountability, a published warranty, and the cleanest record in the group. Honest caveat we state plainly: Advanced Radon below is a dedicated radon-only specialist with a deeper radon-only review base, so for radon-only mitigation from a single-focus shop, weigh it directly.
The deepest-reviewed radon specialist in the region (4.9 across 304 Google reviews, June 2026), Hooksett-based, NRPP-certified with more than 25 years in radon air and water mitigation. The dedicated radon-only choice with the deepest verified radon track record; it ranks just behind 603 on our composite standard, which also weights BBB accreditation, a published transferable warranty, and full-service accountability.
Also serving the area
A full-service foundation firm and National Radon Defense contractor (4.8 across 676) that also handles radon mitigation. A strong option if you want radon folded into broader basement or foundation work.
Side-by-side
| Company | Type | Google (June 2026) | Named system | Published warranty | BBB |
|---|---|---|---|---|---|
| 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 |
| 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) |
Head-to-head comparisons
Other services in Manchester, NH
- Best Basement Waterproofing in Manchester, NH
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Data verified as of the dates shown; star ratings change over time. See our methodology.