Thompsonville, IL Radon Levels

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.

Check local Thompsonville radon levels and find certified testing and mitigation professionals to keep your home safe

Thompsonville, IL Radon Facts

EPA Radon Zone Zone 2 — Moderate Risk 2–4 pCi/L (Zone 2)

County Franklin County, IL

Zip Code 62890

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.

5.00

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 5.00 pCi/L, based on 5 tests from 5 nearby cities. No readings have been submitted for Thompsonville yet, so the closest recorded data is shown as a benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Thompsonville, IL Radon Mitigation

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

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Radon Readings Near Thompsonville, IL

No homeowner tests have been submitted for Thompsonville yet. The closest cities with user-submitted radon data are shown below — explore them to gauge local conditions. Radon varies by home, so testing is the only way to know your level.

City	Distance	Avg User Level	Readings
Marion	13.8 mi	5.00 pCi/L	1
Mount Vernon	31.1 mi	4.00 pCi/L	1
Murphysboro	31.8 mi	10.00 pCi/L	1
Campbell Hill	44.3 mi	1.00 pCi/L	1
Kell	44.5 mi	5.00 pCi/L	1

Franklin County Radon Profile

EPA mapping assigns Franklin County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Direct test data for Franklin County remains limited, so the closest neighboring readings are used here to represent the radon conditions homeowners are likely to encounter. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Franklin County home regardless of zone or a neighbor's results.

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.

Why are radon readings shown from areas near Thompsonville?

No homeowner radon tests have been submitted for Thompsonville yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Franklin County average—are the best available indicator of local conditions until Thompsonville homeowners submit their own results. The EPA still recommends testing every individual home, since levels can vary significantly from house to house.

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.