GFS Radon, Inc.

GFS Radon does one thing: it gets radon out of North Shore basements. The Salem company installs mitigation systems and does radon testing for homes and commercial properties, and says it has 25 years of experience and holds certification in radon testing and mitigation. The record is small but uniformly strong — a 5.0 average across 12 Google ratings, seven written reviews running 2024 to 2026, and two separate Reddit recommendations from Lynn neighbours. In a December 2025 thread a homeowner reported going with GFS and being "Super happy with their work. Reasonable rates, that were clearly explained." What customers describe most is the numbers actually moving. An August 2025 reviewer with a complex basement floor had a multi-point suction system installed and watched radon drop from 7 to 0.9. A March 2024 customer saw levels fall from around 10 to below 2 within twelve hours of the install. A September 2025 reviewer confirmed the result independently against their own continuous monitor. The owner, Ryan, is named in nearly every review, and the follow-through gets its own praise. In a December 2025 account, a customer whose suction fan failed years after the original install said Ryan offered to come out the next day with a replacement. An October 2025 reviewer working a real-estate closing had him onsite within two days and followed up with both buyer and seller once the post-install test results were in — useful if you're mitigating against a purchase-and-sale deadline. And in an April 2026 review, a homeowner had him optimise a system a different company had installed for a previous owner and would not revisit. The licence and insurance claim comes from the company's own website with no number attached, so ask for the certificate and the radon-mitigation certification number before work starts. If you're on the North Shore with a hot basement — especially against a closing date — this is a specialist with a short but consistently good record and a demonstrated habit of standing behind old installs.