You can't see it, smell it, or taste it, but the granite under Plymouth County pushes radon into basements every day. We test your home, install the fix, and retest to prove the number dropped.
Sub-slab depressurization sized to your foundation: sealed suction point, quiet inline fan, vent above the roofline, and a retest that proves the number dropped.
Radon Mitigation System Installation →48 to 96 hour continuous monitor or charcoal test with a written report. Know your number before you spend a dollar on anything else.
Radon Testing →Buying or selling in Plymouth County? Closed-house protocol testing inside your inspection window, results in 48 hours, report your attorney can use.
Real Estate Radon Testing →On a well in South Plymouth, Carver, or Plympton? Radon dissolves in groundwater and releases in your shower. Aeration systems strip it before it enters the house.
Radon in Well Water Treatment →Passive rough-ins and active systems for new builds and additions. Cheapest radon system you'll ever buy is the one installed before the slab pours.
New Construction Radon Systems →Radon fans die quietly after 5 to 10 years and the house fills back up. Manometer checks, fan swaps, and retests for systems any company installed.
Radon System Repair & Fan Replacement →A 48 to 96 hour professional test tells you your actual number. No number, no guesswork, no sales pitch.
If you're over 4.0, you get a written price for a system designed for your specific foundation. Fieldstone, poured, slab, or crawlspace: each one gets a different approach.
Most residential systems go in within a day: sealed suction point, PVC run, quiet inline fan, vent above the roofline.
Every install includes a post-mitigation retest. You don't pay for a promise, you pay for a number you can see.
Written results for your records, your buyer, or your attorney. In this county, that document has real value at closing time.
Plymouth's housing stock spans every radon-prone foundation: fieldstone Chiltonville capes, poured-concrete North Plymouth ranches with sump pits, and slab-on-grade Pinehills builds that route radon differently than a basement does. Private wells across South Plymouth, Carver, and Plympton add a second pathway, since radon dissolves in groundwater and releases into the air with every shower.
A crew that works these foundations weekly gets it right the first time; a call-center franchise doesn't.
Nobody puts prices on these sites, so here are the honest ranges most companies hide until the surprise bill.
Every job gets a written quote before work starts, and that's the price unless we find contamination you can see for yourself.
| Job | Typical range |
|---|---|
| Radon Mitigation System Installation | $1,200 – $2,500 |
| Radon Testing | $175 – $275 |
| Real Estate Radon Testing | $200 – $300 |
| Radon in Well Water Treatment | $3,000 – $6,500 |
| New Construction Radon Systems | $400 – $900 |
| Radon System Repair & Fan Replacement | $350 – $700 |
What moves the price: foundation type, footprint size, whether the run can go through a garage or has to climb an exterior wall, and how far below 4.0 you're starting from.
The data says yes: more than a quarter of Plymouth radon tests from the last decade came back at or above the 4.0 action level, per state DPH testing data. But averages describe towns, not addresses: the only way to know your house is a test.
The EPA recommends fixing your home at 4.0 pCi/L or higher and considering it between 2.0 and 4.0. Radon is the second leading cause of lung cancer in the US after smoking. There's no "safe" level, but below 2.0 is the practical target a good system hits.
Most single-family systems here run $1,200 to $2,500 installed, with the full cost breakdown on our mitigation page.
Levels typically drop within 24 hours of the fan switching on. The retest confirms it.
Smart sellers do. Test high now and you control the timeline and contractor; let the buyer's inspector find it first and you're negotiating under deadline pressure.
The opposite. A documented system with a passing retest is a selling point in this county: it's one less contingency for a buyer to raise.
A real concern on private wells in South Plymouth, Carver, and Plympton; our well water treatment page covers testing and aeration.
Radon Mitigation for Plymouth and Plymouth County. Test it. Fix it. Prove it's fixed.
(508) 503-6186