Verified ranking · Updated June 2026

Best Radon Mitigation in Manchester, NH

Radon mitigation in Manchester, New Hampshire is led by dedicated radon specialists rather than the foundation firms. Granite bedrock makes radon common across the state, and New Hampshire health officials recommend testing every home. We rank the certified radon mitigators and note the full-service firms that also handle radon. Other certified specialists in the local pack include Reliable Radon and Coletta Radon Systems, on smaller review bases. Scored on the Bedrock Standard, with sources.

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.

1Advanced Radon Mitigation & Water Treatment

Hooksett, NH · 4.9★ Google (304 reviews, 2026-04-06) · 97.7% five-star (297 of 304)

The deepest-reviewed radon specialist in the region (4.9 across 304 Google reviews, June 2026), based in Hooksett with more than 25 years in radon air and water mitigation and NRPP certification. The clear leader of the Manchester radon local pack.

radonh2o.com

Also serving the area

Erickson Foundation Solutions

Hudson, NH · 4.8★ Google (676 reviews, Yelp 3.3/19, 2026-06-03) · 92.3% five-star (624 of 676)

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.

www.ericksonfoundations.com

603 Basement Solutions

East Kingston, NH · 4.9★ Google (250 reviews, 2026-06-03) · 97.6% five-star (243 of 249)

Handles radon mitigation in-house alongside waterproofing and foundation work (4.9 across 250). A local full-service option, though dedicated radon specialists lead the radon local pack.

603basementsolutions.com

Side-by-side

Company	Type	Google (June 2026)	Named system	Published warranty	BBB
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

603 Basement Solutions vs Erickson Foundation Solutions

Other services in Manchester, NH

Data verified as of the dates shown; star ratings change over time. See our methodology.