Winthrop, MA Radon Levels

Q: What EPA Radon Zone is Winthrop in?

Winthrop is in Suffolk County, EPA Zone 3.

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

No homeowner radon tests have been submitted for Winthrop 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 Winthrop?

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

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

Winthrop, MA Radon Facts

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

County Suffolk County, MA

Zip Code 02152

Connected to Boston by a narrow causeway, Winthrop in Suffolk County sits on filled coastal land over marine clay deposits within the Boston Metro area. This densely populated peninsula community features primarily multi-family housing and condominiums, many with partial basements or ground-level units close to the water table. While comprehensive radon data for zip code 02152 is currently limited, residents should consider testing given the unique coastal geology and Massachusetts' variable radon conditions.

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 Winthrop 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+

Winthrop, 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 Winthrop, MA

No homeowner tests have been submitted for Winthrop 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	4.4 mi	51-99 Years	Full Basement	May 2021
5 pCi/L	Malden, MA	5.5 mi	21-50 Years	No Basement/All Slab	Jun 2023
5 pCi/L	Saugus, MA	6.2 mi	0-20 Years	Full Basement	Aug 2017
2 pCi/L	Somerville, MA	6.5 mi	51-99 Years	Full Basement	Mar 2024
5 pCi/L	Somerville, MA	6.5 mi	100+ Years	Full Basement	Mar 2022
6 pCi/L	Somerville, MA	6.5 mi	100+ Years	Full Basement	Dec 2016
4 pCi/L	Lynn, MA	6.7 mi	—	Full Basement	May 2016
4 pCi/L	Melrose, MA	7.1 mi	51-99 Years	No Basement/All Slab	Mar 2022

Readings are drawn from the nearest cities with submitted data. Have a result for Winthrop? 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 Winthrop, MA

What EPA Radon Zone is Winthrop in?

Winthrop and the 02152 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 Winthrop?

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

Radon mitigation in Winthrop 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 Winthrop?

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 Winthrop, MA

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

City	Distance	Avg User Level	Submissions
Everett	4.4 mi	4.50 pCi/L	2
Malden	5.5 mi	5.00 pCi/L	2
Saugus	6.2 mi	5.00 pCi/L	1
Somerville	6.5 mi	4.50 pCi/L	4
Lynn	6.7 mi	4.00 pCi/L	1
Melrose	7.1 mi	5.00 pCi/L	3
Medford	7.2 mi	8.00 pCi/L	3
Swampscott	7.7 mi	4.50 pCi/L	2