Stonington, CT Radon Mitigation and Testing

Q: What EPA Radon Zone is Stonington in?

Stonington is in New London County, EPA Zone 1.

Q: How much does radon mitigation cost in Stonington?

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

New London County

EPA Zone 1

Located in New London County along Connecticut's southeastern coast, Stonington features historic homes and newer coastal developments on glacial deposits over bedrock. With radon testing data limited for zip code 06378, homeowners should conduct individual testing to assess their risk. Connecticut's geological complexity and varied housing stock make radon testing an important safety consideration for all residents.

Stonington, CT Radon Mitigation

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

Stonington, CT Radon Testing

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

Stonington Radon Facts

Key details about the radon risk profile for Stonington and the 06378 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

New London County, CT

Zip Code

06378

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Stonington and the 06378 zip code are located in New London 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 Stonington, CT

What EPA Radon Zone is Stonington in?

Stonington and the 06378 zip code are in New London 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 Stonington?

Radon mitigation in Stonington 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 Stonington?

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