Duxbury homeowners test more than anyone else in this service area: 221 tests per 1,000 occupied homes, against a county pattern closer to 130. Of 1,347 tests on record, 221 came back at or above 4.0 pCi/L.
The high testing rate changes what a seller is walking into here. Buyers in Duxbury expect a number, and increasingly they expect it before the listing goes up.
Massachusetts DPH publishes every radon test result reported in the state by town. Here is what 1,347 Duxbury tests from 2015 through 2024 look like.
| Measure | Duxbury, MA | What it means |
|---|---|---|
| Tests on record, 2015-2024 | 1,347 | The sample this table is built on |
| Median result | 1.8 pCi/L | Half of Duxbury homes tested came in below this |
| Geometric mean | 1.8 pCi/L | The typical result, with outliers damped |
| Tests at or above 4.0 pCi/L | 221 (16.4%) | EPA says fix the house at this level |
| Tests between 2.0 and 4.0 | 29% | EPA says consider fixing |
| Tests below 2.0 | 54.6% | No action recommended |
| Highest single result on record | 26.8 pCi/L | One house, not the town, but it was somebody's house |
| Tests per 1,000 occupied homes | 221.1 | How thoroughly the town has actually been checked |
Source: Massachusetts Department of Public Health radon testing data, town-level export, 2015-2024.
A surprise 6.0 discovered during a buyer's inspection on a seven-figure sale costs more than the mitigation system. It hands the buyer the renegotiation, and every day the deal sits open costs somebody money.
Testing before listing puts the number in your hands. If it is low, it goes in the listing sheet as a selling point. If it is high, a $1,200 to $2,500 system installed quietly in advance is cheaper than the credit a buyer will ask for, and the retest paperwork closes the question before it gets asked.
Duxbury's recorded maximum is 26.8 pCi/L, lower than Plymouth or Kingston, and the spread of results here is tighter than either. That makes an elevated Duxbury result less likely, and more surprising when it happens.
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 Duxbury 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 Duxbury 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 1,347 Duxbury tests on record from 2015 through 2024, 16.4% came back at or above the EPA's 4.0 pCi/L action level, and another 29% landed between 2.0 and 4.0. The town median is 1.8 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.
It is the cheaper order of operations. Roughly one in six Duxbury tests comes back at or above 4.0 pCi/L, and finding that during a buyer's inspection hands them the renegotiation. A pre-listing test costs a few hundred dollars and either becomes a selling point or buys you time to fix it on your own schedule.
One call covers testing, mitigation, well-water treatment and system repair anywhere in Duxbury 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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