Dover radon mitigation — local context
Test before you assume. Dover sits in Norfolk County, which the EPA's Map of Radon Zones rates Zone 2 ("moderate potential," a predicted average indoor screening level between 2 and 4 pCi/L) — not the highest-risk Zone 1 that covers Essex, Middlesex and Worcester. Moderate is not zero: the Massachusetts Department of Public Health, Bureau of Environmental Health states "an estimated 1 out of 4 homes are predicted to have high radon levels (above the U.S. Environmental Protection Agency's action level of 4 pCi/L)," and DPH adds radon is "the #1 cause of lung cancer among people who don't smoke," with about 21,100 U.S. deaths a year. The Dedham Granite bedrock underlying the Dover area south and west of Boston is a uranium-bearing radon source, and the Charles River that forms Dover's northern edge (USGS gauge "Charles River at Dover, MA," site 01103500) keeps the water table high. Our radon mitigation runs $900–$6,000 (most jobs $1,950–$2,250); the $50 radon test is credited toward the job if you proceed. Radon cert RMS-113966.
What a recent customer said
603 Basement Solutions has a great team to work with. All involved are professional and courteous. The Radon Mitigation quote I received was the final price. I understand unseen problems occur, but I was fortunate. They estimated my radon levels would drop to around 2 but my monitor is reading a 7 day average of .4, WELL below what I was promised and even expected. Highly recommend 603 Basement Solutions — Jeff Eddy, Google review (5 stars)
Frequently asked questions
What EPA radon zone is Dover, MA in?
Dover is in Norfolk County, which the EPA's Map of Radon Zones classifies as Zone 2 — "moderate potential," defined as a predicted average indoor screening level between 2 and 4 pCi/L. That is a step below the highest-risk Zone 1 counties in Massachusetts (Essex, Middlesex, Worcester). Zone designation does not tell you about your specific house, though: the EPA and Massachusetts DPH both say every home should be tested regardless of zone, because radon levels vary house to house.
How common is high radon in Massachusetts homes?
The Massachusetts Department of Public Health, Bureau of Environmental Health, states that "an estimated 1 out of 4 homes are predicted to have high radon levels (above the U.S. Environmental Protection Agency's action level of 4 pCi/L)." DPH also notes radon is the #1 cause of lung cancer among people who don't smoke, with an estimated 21,100 U.S. deaths a year. Testing your home is the only way to know whether yours is one of them.
Why might a Dover home have radon when it is not in a Zone 1 area?
Two local factors matter beyond the county zone. First, the Dedham Granite bedrock underlying the Dover area south and west of Boston is granite, and radon comes from uranium decaying in granite and soil. Second, the Charles River forms Dover's northern boundary (the USGS gauge there is literally named "Charles River at Dover, MA," site 01103500), which keeps the seasonal water table high, while New England freeze-thaw cycles open cracks in older foundations — common in a town first settled in 1640. Those cracks are radon entry paths.