Dorchester, MA Radon Levels

Q: What EPA Radon Zone is Dorchester in?

Dorchester is in Suffolk County, EPA Zone 3.

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

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

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

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

Dorchester, MA Radon Facts

EPA Radon Zone Zone 3 — Low Risk < 2.0 pCi/L (Zone 3)

County Suffolk County, MA

Zip Code 02121

As a diverse neighborhood within Suffolk County and the greater Boston metro area, Dorchester (02121) sits in EPA Zone 3 where coastal New England geology typically produces lower radon levels. However, with limited testing data available, residents should still consider radon testing since urban areas can show surprising variation. The neighborhood's dense housing mix and varied foundation types make individual assessment valuable.

6.00

pCi/L area average

Above EPA Action Level

Suffolk County average: 6.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Dorchester 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+

Dorchester, 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 Dorchester, MA

No homeowner tests have been submitted for Dorchester 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
Roslindale	3.0 mi	6.00 pCi/L	1
Milton	3.0 mi	7.00 pCi/L	1
Quincy	3.8 mi	10.50 pCi/L	2
Newton Center	6.1 mi	4.50 pCi/L	2
Somerville	6.7 mi	4.50 pCi/L	4
Braintree	7.3 mi	9.00 pCi/L	1
North Weymouth	7.4 mi	10.00 pCi/L	2
Newtonville	7.8 mi	3.00 pCi/L	1

Suffolk County Radon Profile

Suffolk County is classified as EPA Radon Zone 3, the lowest predicted-risk tier, with modeled indoor screening averages below 2 pCi/L. Homeowner-submitted tests from 1 city in Suffolk County average 6.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Radon is the second leading cause of lung cancer in the United States, and a short-term test is the only way to confirm a specific home's level in Suffolk County.

Radon FAQ for Dorchester, MA

What EPA Radon Zone is Dorchester in?

Dorchester and the 02121 zip code are in Suffolk County, which has an EPA assigned Radon Zone of 3. A zone of 3 predicts an average indoor radon screening level less than 2 pCi/L.

Why are radon readings shown from areas near Dorchester?

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

Radon mitigation in Dorchester 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 Dorchester?

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.