Dennis, MA Radon Levels

Q: What EPA Radon Zone is Dennis in?

Dennis is in Barnstable County, EPA Zone 2.

Q: Why are radon readings shown from areas near Dennis?

No homeowner radon tests have been submitted for Dennis yet, so readings from the closest cities and the Barnstable County average are used as the best available indicator of local conditions. The EPA recommends testing every individual home.

Q: How much does radon mitigation cost in Dennis?

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

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

Dennis, MA Radon Facts

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

County Barnstable County, MA

Zip Code 02638

Positioned on Barnstable County's Cape Cod within the Cape Cod Metro area, Dennis sits on glacial outwash deposits and sandy soils typical of the region. Current testing data for zip code 02638 is limited, though Cape Cod's sandy geology typically produces lower radon levels. Despite generally moderate risk, homeowners should still test since geological variations and home construction factors can influence individual readings.

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 Dennis 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+

Dennis, 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 Dennis, MA

No homeowner tests have been submitted for Dennis 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	12.2 mi	6.00 pCi/L	1
Sandwich	14.8 mi	10.00 pCi/L	1
Mashpee	17.1 mi	5.00 pCi/L	4
Buzzards Bay	19.8 mi	9.50 pCi/L	2
North Falmouth	23.1 mi	6.00 pCi/L	1
Falmouth	25.1 mi	7.00 pCi/L	1
Plymouth	26.3 mi	7.00 pCi/L	1
Kingston	33.6 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 Dennis, MA

What EPA Radon Zone is Dennis in?

Dennis and the 02638 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 Dennis?

No homeowner radon tests have been submitted for Dennis 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 Dennis 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 Dennis?

Radon mitigation in Dennis 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 Dennis?

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.