Charlestown, MA Radon Levels

Q: What EPA Radon Zone is Charlestown in?

Charlestown is in Suffolk County, EPA Zone 3.

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

No homeowner radon tests have been submitted for Charlestown 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 Charlestown?

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

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

Charlestown, MA Radon Facts

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

County Suffolk County, MA

Zip Code 02129

Located in Suffolk County as part of Boston's urban core, Charlestown sits on glacial deposits and underlying bedrock typical of eastern Massachusetts. Testing data for the 02129 zip code area remains sparse, making individual radon testing important for residents of this historic neighborhood. The area's dense mix of 19th-century row houses and modern high-rise developments presents varying radon risk profiles depending on construction type and foundation characteristics.

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 Charlestown 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+

Charlestown, 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 Charlestown, MA

No homeowner tests have been submitted for Charlestown yet, so the closest user-submitted readings from neighboring communities are shown below. Radon varies by home — testing is the only way to know your level.

Radon Level	City	Distance	Home Age	Foundation	Submitted
4 pCi/L	Everett, MA	2.4 mi	51-99 Years	Full Basement	May 2021
2 pCi/L	Somerville, MA	2.4 mi	51-99 Years	Full Basement	Mar 2024
5 pCi/L	Somerville, MA	2.4 mi	100+ Years	Full Basement	Mar 2022
6 pCi/L	Somerville, MA	2.4 mi	100+ Years	Full Basement	Dec 2016
5 pCi/L	Malden, MA	3.5 mi	21-50 Years	No Basement/All Slab	Jun 2023
5 pCi/L	Medford, MA	3.6 mi	100+ Years	Full Basement	May 2025
4 pCi/L	Medford, MA	3.6 mi	100+ Years	Full Basement	Oct 2023
15 pCi/L	Medford, MA	3.6 mi	51-99 Years	Full Basement	Aug 2020

Readings are drawn from the nearest cities with submitted data. Have a result for Charlestown? Submit your reading to help your neighbors.

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 Charlestown, MA

What EPA Radon Zone is Charlestown in?

Charlestown and the 02129 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 Charlestown?

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

Radon mitigation in Charlestown 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 Charlestown?

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.

Radon Levels Near Charlestown, MA

User-submitted radon levels from the cities closest to Charlestown with recorded test data. Explore nearby communities to compare local readings.

City	Distance	Avg User Level	Submissions
Everett	2.4 mi	4.50 pCi/L	2
Somerville	2.4 mi	4.50 pCi/L	4
Malden	3.5 mi	5.00 pCi/L	2
Medford	3.6 mi	8.00 pCi/L	3
Melrose	5.5 mi	5.00 pCi/L	3
Arlington	6.0 mi	4.00 pCi/L	2
Saugus	6.5 mi	5.00 pCi/L	1
Winchester	6.7 mi	4.00 pCi/L	2