Greenwich, CT Radon Levels

Q: What is the average radon level in Greenwich, CT?

Based on 3 user-submitted tests, the average radon level is 7.70 pCi/L.

Q: What EPA Radon Zone is Greenwich in?

Greenwich is in Fairfield County, EPA Zone 1.

Q: How much does radon mitigation cost in Greenwich?

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

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

Greenwich, CT Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Fairfield County, CT

Zip Code 06830

Avg. User Level 7.70 pCi/L

User Tests 3

Nestled in affluent Fairfield County along Connecticut's Gold Coast, Greenwich sits on crystalline bedrock and glacial deposits that contribute to significant radon potential. Testing data across zip codes 06830 and 06831 shows an average radon level of 7.67 pCi/L, nearly double the EPA action threshold. The community's mix of historic estates and modern homes, many with finished basements, creates ideal conditions for radon accumulation in this prestigious coastal enclave.

7.70

pCi/L average

Above EPA Action Level

Based on 3 user-submitted radon tests for homes in Greenwich, CT. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Greenwich, CT Radon Mitigation

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Greenwich, CT Radon Levels

User-submitted radon test readings from homes in the Greenwich area.

Radon Level	City	Home Age	Foundation
15 pCi/L	Greenwich, CT	21-50 Years	Full Basement
4 pCi/L	Greenwich, CT	0-20 Years	—

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Radon FAQ for Greenwich, CT

What is the average radon level in Greenwich, CT?

Based on 3 user-submitted tests, the average radon level in Greenwich is 7.70 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Greenwich in?

Greenwich and the 06830 zip code are in Fairfield County, which has an EPA assigned Radon Zone of 1. A zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L.

How much does radon mitigation cost in Greenwich?

Radon mitigation in Greenwich 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 Greenwich?

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.

Most Active Radon Markets in Connecticut

Cities in Connecticut with the most user-submitted radon test data, ranked by number of submissions.

City	Avg User Radon Level	Submissions
Hamden	4.75 pCi/L	4
West Hartford	4.25 pCi/L	4
Greenwich	7.67 pCi/L	3
Norwalk	7.00 pCi/L	1
Stamford	5.00 pCi/L	1
Middletown	4.00 pCi/L	1
Guilford	No submissions	0
Ridgefield	No submissions	0

Greenwich, CT Radon Levels

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

Greenwich, CT Radon Facts

Greenwich, CT Radon Mitigation

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Greenwich, CT Radon Levels

Radon FAQ for Greenwich, CT

Most Active Radon Markets in Connecticut

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