Norwalk, CT Radon Mitigation and Testing

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

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

Q: What EPA Radon Zone is Norwalk in?

Norwalk is in Fairfield County, EPA Zone 1.

Q: How much does radon mitigation cost in Norwalk?

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

Norwalk in Fairfield County shows elevated radon levels averaging 7.0 pCi/L, significantly exceeding EPA's action threshold. This southwestern Connecticut community's location along the coast, combined with glacial deposits over crystalline bedrock, creates conditions where radon can accumulate in basement foundations typical of New England homes. Immediate testing and mitigation are strongly recommended for all residential properties in the 06850 zip code area.

7.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Norwalk, CT Radon Mitigation

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

Norwalk, CT Radon Testing

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

Norwalk, Connecticut Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
7 pCi/L	Norwalk, CT	51-99 Years	Partial Basement	Sep 2023

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

Norwalk Radon Facts

Key details about the radon risk profile for Norwalk and the 06850 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Fairfield County, CT

Zip Code

06850

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

7.00 pCi/L

User Tests Submitted

Norwalk and the 06850 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 Norwalk, CT

What is the average radon level in Norwalk, CT?

Based on 1 user-submitted test, the average radon level in Norwalk 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 Norwalk in?

Norwalk and the 06850 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 Norwalk?

Radon mitigation in Norwalk 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 Norwalk?

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