Radon answers for Mansfield, Massachusetts homes
What a radon number means, how to test the right way, and how to find a certified pro if your house needs a system. We don't sell anything here.
Three guides that cover most radon questions
Testing comes first. Mitigation only matters if the number comes back high. Water is its own question, and it depends on where your water comes from.
From a test kit to a lower number
Most houses go through the same four steps. Plenty stop after the second one.
Test the lowest lived-in floor
Set the kit where you actually spend time, usually a finished basement or the first floor. Keep windows and doors shut for at least 12 hours before and during a short-term test.
Read the number against 4.0
EPA recommends fixing a home at 4 pCi/L or higher and says to consider fixing between 2 and 4. A single short test near the line is worth repeating.
Hire a certified mitigator
Massachusetts doesn't license radon contractors, so look for an individual certified through NRPP or NRSB on the state's list.
Retest after the fan runs
A system isn't finished until a follow-up test shows the level came down. Test again every couple of years after that.
Where our numbers come from
Radon advice online is full of scare figures. These are the ones that matter here, each linked to the agency that published it.
Written to answer questions, not to sell a system
A contractor's website has a reason to make your number sound scary. This one doesn't.
- We don't test or install anything
- There's no quote to push and no crew to schedule. When you need a pro, we send you to the state's list of certified people so you can pick.
- Every figure has a source
- Action levels, certification rules, and water facts link back to EPA, Massachusetts DPH, or the Town of Mansfield.
- It's written for houses around here
- Basements, older foundations, town water pumped from groundwater wells, and private wells all change the answer a little.
Radon usually gets in through the slab and the joint where floor meets wall.
Homes in and around Mansfield
The testing and mitigation advice applies anywhere in Massachusetts. The water section is specific to Mansfield's town supply.
Bristol County, MA
- Mansfield
- East Mansfield
- West Mansfield
Why radon shows up in houses like ours
Radon is a gas that comes from uranium breaking down in rock and soil. It has no smell and no color, and it moves up through the ground into whatever is sitting on top. A house draws it in because the air inside is slightly lower in pressure than the soil underneath, especially in winter with the heat running.
The gaps it uses are ordinary ones. The joint where the basement floor meets the wall. Cracks in the slab. An open sump pit. Holes where pipes come through. Older New England houses on fieldstone or rubble foundations have more of those gaps than a newer poured basement, but a new house can still test high.
That’s why the only answer that counts is a test in your own house. Our radon testing guide walks through how to do one right, and the mitigation guide covers what happens if the number comes back above 4.
What people ask first
Does my Mansfield house need a radon test?
Yes. EPA and Massachusetts DPH both recommend testing every home. Radon levels vary from one house to the next on the same street, so a neighbor's result doesn't tell you yours.
What number is too high?
EPA recommends fixing a home at 4 pCi/L or higher and considering a fix between 2 and 4 pCi/L. No level is zero risk.
Does Massachusetts license radon contractors?
No. The state doesn't certify radon professionals. DPH recommends hiring someone certified by the National Radon Proficiency Program (NRPP) or the National Radon Safety Board (NRSB).
Is this site a radon company?
No. We don't test, install, or sell anything. We explain how it works and point you to the state's list of certified professionals.
Who can I call with a radon question?
The Massachusetts DPH Radon Information Line is toll-free inside the state at (800) 723-6695, Monday through Friday.
- We don't sell tests or install systems
- Every figure links to its source
- Built on Massachusetts DPH and EPA guidance