Thompsonville, IL Radon Mitigation and Testing

Q: What EPA Radon Zone is Thompsonville in?

Thompsonville is in Franklin County, EPA Zone 2.

Q: How much does radon mitigation cost in Thompsonville?

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

Franklin County

EPA Zone 2

Thompsonville sits in Franklin County in southern Illinois, where Pennsylvanian-era coal measures and shale create moderate radon conditions typical of the Illinois Basin region. The community's housing includes both historic properties and newer rural developments, many featuring partial basement or crawl space foundations. Since radon testing data is not currently available for zip code 62890, homeowners should consider professional testing to establish baseline readings.

Thompsonville, IL Radon Mitigation

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

Thompsonville, IL Radon Testing

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

Thompsonville Radon Facts

Key details about the radon risk profile for Thompsonville and the 62890 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Franklin County, IL

Zip Code

62890

Predicted Screening Level

2–4 pCi/L (Zone 2)

Thompsonville and the 62890 zip code are located in Franklin 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 Thompsonville, IL

What EPA Radon Zone is Thompsonville in?

Thompsonville and the 62890 zip code are in Franklin 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 Thompsonville?

Radon mitigation in Thompsonville 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 Thompsonville?

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