Chatham, MA Radon Levels

Q: What EPA Radon Zone is Chatham in?

Chatham is in Barnstable County, EPA Zone 2.

Q: How much does radon mitigation cost in Chatham?

Radon mitigation typically costs between $800 and $2,000. Most standard systems fall in the $1,000-$1,500 range.

Check local Chatham radon levels and find certified testing and mitigation professionals to keep your home safe

Chatham, MA Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Barnstable County, MA

Zip Code 02633

Positioned on Barnstable County's Cape Cod peninsula, Chatham features sandy glacial deposits and coastal plain sediments that influence local radon patterns. Limited testing data exists for this 02633 zip code area within the Cape Cod Metro, making individual home assessment important. The area's unique coastal geology and predominantly newer construction warrant professional radon evaluation.

6.80

pCi/L area average

Above EPA Action Level

Barnstable County average: 6.80 pCi/L, based on 10 user-submitted tests across 6 cities in the county. No homeowner readings have been submitted for Chatham itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Chatham, MA Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

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Radon Readings Near Chatham, MA

No homeowner tests have been submitted for Chatham yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Osterville	21.6 mi	6.00 pCi/L	1
Sandwich	26.1 mi	10.00 pCi/L	1
Mashpee	26.9 mi	5.00 pCi/L	4
Buzzards Bay	31.0 mi	9.50 pCi/L	2
North Falmouth	33.7 mi	6.00 pCi/L	1
Falmouth	34.6 mi	7.00 pCi/L	1
Plymouth	37.7 mi	7.00 pCi/L	1
Kingston	44.9 mi	4.00 pCi/L	1

Barnstable County Radon Profile

EPA mapping assigns Barnstable County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 6 cities in Barnstable County average 6.80 pCi/L across 10 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Barnstable County home regardless of zone or a neighbor's results.

Radon FAQ for Chatham, MA

What EPA Radon Zone is Chatham in?

Chatham and the 02633 zip code are in Barnstable County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

Why are radon readings shown from areas near Chatham?

No homeowner radon tests have been submitted for Chatham yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Barnstable County average—are the best available indicator of local conditions until Chatham homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

How much does radon mitigation cost in Chatham?

Radon mitigation in Chatham typically costs between $800 and $2,000. Most homes with standard basements can be mitigated with a sub-slab depressurization system in the $1,000–$1,500 range. Factors that can increase cost include complex foundations, crawl spaces, or very high radon levels.

Should I test for radon if I'm buying a home in Chatham?

Yes. Radon testing should be part of every home purchase. A short-term radon test is typically included as part of the home inspection process and costs $150–$250. If elevated levels are found, you can negotiate mitigation as part of the sale.