Cos Cob, CT Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 7.00 pCi/L.

Q: What EPA Radon Zone is Cos Cob in?

Cos Cob is in Fairfield County, EPA Zone 1.

Q: How much does radon mitigation cost in Cos Cob?

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

Avg: 7.00 pCi/L

Fairfield County

EPA Zone 1

1 user test

Nestled in Fairfield County along Connecticut's southwestern coast, Cos Cob has recorded a radon level of 7.0 pCi/L based on available testing data. This reading significantly exceeds the EPA action level, indicating radon mitigation is likely needed for homes in this 06807 zip code area. The community's location on glacial deposits over metamorphic bedrock creates conditions conducive to radon accumulation.

7.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Cos Cob, CT. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Cos Cob, CT Radon Mitigation

Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.

Cos Cob, CT Radon Testing

Finding qualified radon testing professionals is the first step toward protecting your home.

Cos Cob, Connecticut Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
7 pCi/L	Cos Cob, CT	51-99 Years	Full Basement	Jan 2022

Have a radon test result for Cos Cob? Submit your reading to help other homeowners.

Cos Cob Radon Facts

Key details about the radon risk profile for Cos Cob and the 06807 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Fairfield County, CT

Zip Code

06807

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

7.00 pCi/L

User Tests Submitted

Cos Cob and the 06807 zip code are located in Fairfield County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Cos Cob, CT

What is the average radon level in Cos Cob, CT?

Based on 1 user-submitted test, the average radon level in Cos Cob is 7.00 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 Cos Cob in?

Cos Cob and the 06807 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 Cos Cob?

Radon mitigation in Cos Cob 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 Cos Cob?

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 with the most user-submitted radon test data in the state.

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