Pembroke's radon record covers 1,107 tests from 2015 through 2024, with 174 of them at or above the EPA's 4.0 pCi/L action level and a highest reading of 28.9. The median result is 1.6 pCi/L.
Pembroke is reasonably well tested at 161 tests per 1,000 occupied homes, which makes its roughly one-in-six rate of elevated results a number you can lean on.
Massachusetts DPH publishes every radon test result reported in the state by town. Here is what 1,107 Pembroke tests from 2015 through 2024 look like.
| Measure | Pembroke, MA | What it means |
|---|---|---|
| Tests on record, 2015-2024 | 1,107 | The sample this table is built on |
| Median result | 1.6 pCi/L | Half of Pembroke homes tested came in below this |
| Geometric mean | 1.7 pCi/L | The typical result, with outliers damped |
| Tests at or above 4.0 pCi/L | 174 (15.7%) | EPA says fix the house at this level |
| Tests between 2.0 and 4.0 | 25.1% | EPA says consider fixing |
| Tests below 2.0 | 59.2% | No action recommended |
| Highest single result on record | 28.9 pCi/L | One house, not the town, but it was somebody's house |
| Tests per 1,000 occupied homes | 161.3 | How thoroughly the town has actually been checked |
Source: Massachusetts Department of Public Health radon testing data, town-level export, 2015-2024.
Sub-slab depressurization is the standard fix and it is less invasive than most homeowners expect. We core one suction point through the basement slab, seal the visible cracks and the sump lid, run PVC to an inline fan mounted outside the living space, and vent above the roofline away from windows.
The fan draws soil gas out from under the slab before it can enter the house, which reverses the pressure difference that was pulling radon in. Most Pembroke houses need one suction point. Larger footprints or a slab broken up by footings sometimes need two, which is the main thing that moves the price.
Every installation ends with a post-mitigation retest, because a system nobody measured is a guess. A properly sized system in a house that tested at 8.0 typically retests under 2.0.
The EPA Map of Radon Zones assigns Plymouth County to Zone 2, which predicts an average indoor screening level between 2.0 and 4.0 pCi/L. Barnstable, Bristol and Norfolk counties carry the same designation. Worcester, Middlesex and Essex are Zone 1.
The EPA prints a warning on the same map: it should not be used to decide whether an individual home gets tested, and all homes should be tested regardless of zone. The Pembroke numbers in the table above show why. A county-wide prediction cannot tell you what is under one address.
Massachusetts does not license radon contractors. The state's own guidance points homeowners at professionals certified by NRPP or NRSB, and those two certifications are the only credential worth asking about. Ask for the number, not the logo.
An active system puts a fan in the vent stack, and wiring that fan is electrical work, so the Pembroke wiring inspector is normally the one permit stop on a mitigation job. We pull it. Systems that vent above the roofline and discharge away from windows meet the EPA protocol the inspector is checking against.
State testing data says yes for a meaningful share of houses. Of 1,107 Pembroke tests on record from 2015 through 2024, 15.7% came back at or above the EPA's 4.0 pCi/L action level, and another 25.1% landed between 2.0 and 4.0. The town median is 1.6 pCi/L.
Most single-family systems in this county run $1,200 to $2,500 installed, with a post-mitigation retest included. The price turns on foundation type and how many suction points the slab needs, which is why we quote in writing after seeing the house.
A short-term test needs a minimum of 48 hours under closed-house conditions. We use continuous monitors that log hourly, so a test placed Monday is reported Wednesday. Real estate deadlines get priority placement.
Nothing in Massachusetts law requires one, but radon testing is standard practice in home-sale inspections here, and buyers routinely ask for mitigation or a credit when a result comes back high. Testing inside the inspection window costs less than renegotiating after you own it.
One working day for most single-family houses. The crew cores the suction point, seals the slab penetrations and sump, runs the vent stack, mounts the fan and wires it. The 48-hour retest that proves the number dropped starts once the system has been running.
One call covers testing, mitigation, well-water treatment and system repair anywhere in Pembroke and the rest of Plymouth County. Written quote first, retest after.
Sources: Massachusetts Department of Public Health radon testing data 2015-2024; EPA Map of Radon Zones, Massachusetts.
Radon Mitigation for Plymouth and Plymouth County. Test it. Fix it. Prove it's fixed.
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