Manchester radon mitigation — local context
The bedrock under Manchester is the Massabesic Gneiss Complex, a pink, foliated biotite granite named for Lake Massabesic and exposed in road cuts at I-93 Exit 8 (USGS MRData, unit NHZmz). Granite-family bedrock carries the uranium that decays into radon, so the geology here is real — but it is moderate, not the state's worst. The EPA Map of Radon Zones places Hillsborough County in Zone 2 ("moderate potential," 2–4 pCi/L); only Carroll County reaches Zone 1. A 2023 USGS study (via NHPR) found southern NH, where Manchester sits, generally has lower radon than the White Mountains up north. Statewide, NH DHHS reports about 37% of tested homes exceed 4 pCi/L. We mitigate Manchester homes — including crawl-space sub-membrane depressurization for older and fieldstone foundations — for $900–$6,000 (most jobs $1,950–$2,250). The $50 radon test is credited toward the job if you proceed. Certified mitigator RMS-113966. Radon mitigation | radon testing.
What a recent customer said
"I couldn't recommend this company enough! After researching multiple organizations, including Erickson and SWAT, this was the only one that truly had my best interest in mind. They didn't try to sell me unnecessary items or services and were completely honest and transparent throughout the process. They successfully mitigated my radon levels, bringing them down to 0.5 pCi/L, all for a quarter of the cost I was quoted by other companies. Their professionalism, expertise, and fairness set them apart from the rest. If you're looking for radon mitigation or similar services, do yourself a favor and give them a call!" — Timothy Bryan, 5★ (Google review)
Frequently asked questions
Is Manchester, NH a high-radon area?
Manchester sits in Hillsborough County, which the EPA Map of Radon Zones designates Zone 2 — moderate potential, with predicted indoor screening levels of 2–4 pCi/L. Only Carroll County in NH is Zone 1 (high). A 2023 USGS study reported via NHPR also notes that southern NH, where Manchester is, generally has lower radon than the White Mountains and the north. So the risk is real but moderate — testing is still the only way to know your home's actual level.
Why does Manchester have radon at all if it's only Zone 2?
The bedrock under Manchester is the Massabesic Gneiss Complex — a pink, foliated biotite granite named for Lake Massabesic and exposed in road cuts at I-93 Exit 8 (USGS MRData unit NHZmz). Granite-family rock contains uranium, which decays into radon gas that seeps up through soil and foundations. Statewide, NH DHHS reports about 37% of tested homes exceed the EPA action level of 4 pCi/L, so even moderate-zone homes can test high.
How much does radon mitigation cost in Manchester, and is the test free?
603 Basement Solutions mitigates radon for $900–$6,000, with most jobs landing between $1,950 and $2,250. The radon test is $50 — not free — but it is credited toward the job if you proceed. For older or fieldstone-foundation homes common in Manchester, we install crawl-space sub-membrane depressurization systems. Our certified mitigator credential is RMS-113966, and estimates are free.