Thomson, IL Radon Mitigation and Testing

Q: What EPA Radon Zone is Thomson in?

Thomson is in Carroll County, EPA Zone 1.

Q: How much does radon mitigation cost in Thomson?

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

Carroll County

EPA Zone 1

This small community in Carroll County sits along the Mississippi River in northwestern Illinois, where river valley alluvial deposits over limestone bedrock can create variable radon conditions. Thomson's housing consists primarily of older residential properties, many dating from the early-to-mid 1900s with basement foundations typical of river communities. Given the absence of testing data for zip code 61285, homeowners should conduct radon measurements to determine individual property exposure levels.

Thomson, IL Radon Mitigation

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

Thomson, IL Radon Testing

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

Thomson Radon Facts

Key details about the radon risk profile for Thomson and the 61285 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Carroll County, IL

Zip Code

61285

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Thomson and the 61285 zip code are located in Carroll 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 Thomson, IL

What EPA Radon Zone is Thomson in?

Thomson and the 61285 zip code are in Carroll 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 Thomson?

Radon mitigation in Thomson 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 Thomson?

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 Illinois

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

City	Avg User Radon Level	Submissions
Buffalo Grove	6.10 pCi/L	10
Crystal Lake	7.25 pCi/L	8
Lake Zurich	6.00 pCi/L	7
Grayslake	5.00 pCi/L	7
New Lenox	10.17 pCi/L	6
Park Ridge	7.00 pCi/L	6
Arlington Heights	6.17 pCi/L	6
Waterloo	9.20 pCi/L	5
Palatine	7.80 pCi/L	5
Round Lake	7.80 pCi/L	5
Northbrook	6.20 pCi/L	5
Mchenry	11.00 pCi/L	4
Dekalb	8.75 pCi/L	4
Columbia	8.00 pCi/L	4
Lisle	7.25 pCi/L	4
Normal	7.25 pCi/L	4
Antioch	7.00 pCi/L	4
Elk Grove Village	7.00 pCi/L	4
Aurora	6.75 pCi/L	4
Hoffman Estates	6.75 pCi/L	4