Thompson, CT Radon Mitigation and Testing

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

Based on 2 user-submitted tests, the average radon level is 5.00 pCi/L.

Q: What EPA Radon Zone is Thompson in?

Thompson is in Windham County, EPA Zone 2.

Q: How much does radon mitigation cost in Thompson?

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

Avg: 5.00 pCi/L

Windham County

EPA Zone 2

2 user tests

Thompson in Windham County shows an average radon level of 5.0 pCi/L, which exceeds the EPA action threshold of 4.0 pCi/L. Located in northeastern Connecticut's glaciated terrain, the area's granite bedrock and glacial till deposits contribute to elevated radon potential across zip code 06277. The community's older New England housing stock, featuring stone and concrete basement foundations, provides pathways for radon entry that require mitigation attention.

5.00

pCi/L average

Above EPA Action Level

Based on 2 user-submitted radon tests for homes in Thompson, CT. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Thompson, CT Radon Mitigation

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

Thompson, CT Radon Testing

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

Thompson, Connecticut Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Thompson, CT	0-20 Years	Full Basement	Mar 2025
6 pCi/L	Thompson, CT	0-20 Years	Full Basement	Sep 2018

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

Thompson Radon Facts

Key details about the radon risk profile for Thompson and the 06277 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Windham County, CT

Zip Code

06277

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

5.00 pCi/L

User Tests Submitted

Thompson and the 06277 zip code are located in Windham County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Thompson, CT

What is the average radon level in Thompson, CT?

Based on 2 user-submitted tests, the average radon level in Thompson is 5.00 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 Thompson in?

Thompson and the 06277 zip code are in Windham County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

How much does radon mitigation cost in Thompson?

Radon mitigation in Thompson 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 Thompson?

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