Marion, MA Radon Levels

Q: What EPA Radon Zone is Marion in?

Marion is in Plymouth County, EPA Zone 2.

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

No homeowner radon tests have been submitted for Marion yet, so readings from the closest cities and the Plymouth 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 Marion?

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

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

Marion, MA Radon Facts

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

County Plymouth County, MA

Zip Code 02738

This coastal Plymouth community recorded an average radon level of 1.0 pCi/L based on available testing data. The reading falls well within EPA recommended ranges, reflecting the area's coastal geology and newer construction practices typical of southeastern Massachusetts. Despite favorable conditions, homeowners should maintain regular testing schedules as radon levels can fluctuate seasonally.

7.50

pCi/L area average

Above EPA Action Level

Plymouth County average: 7.50 pCi/L, based on 8 user-submitted tests across 7 cities in the county. No homeowner readings have been submitted for Marion 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+

Marion, 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 Marion, MA

No homeowner tests have been submitted for Marion 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
Acushnet	3.7 mi	11.00 pCi/L	1
New Bedford	4.6 mi	6.00 pCi/L	2
North Dartmouth	8.1 mi	10.00 pCi/L	1
South Dartmouth	10.2 mi	20.00 pCi/L	1
North Falmouth	11.8 mi	6.00 pCi/L	1
Falmouth	13.9 mi	7.00 pCi/L	1
Westport	14.0 mi	4.00 pCi/L	1
Buzzards Bay	14.3 mi	9.50 pCi/L	2

Plymouth County Radon Profile

The soils and bedrock of Plymouth County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Homeowner-submitted tests from 7 cities in Plymouth County average 7.50 pCi/L across 8 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Plymouth County to test, as levels can differ between neighboring homes.

Radon FAQ for Marion, MA

What EPA Radon Zone is Marion in?

Marion and the 02738 zip code are in Plymouth 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 Marion?

No homeowner radon tests have been submitted for Marion yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Plymouth County average—are the best available indicator of local conditions until Marion 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 Marion?

Radon mitigation in Marion 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 Marion?

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.