Louisville, IL Radon Levels

Q: What EPA Radon Zone is Louisville in?

Louisville is in Clay County, EPA Zone 2.

Q: How much does radon mitigation cost in Louisville?

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

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

Louisville, IL Radon Facts

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

County Clay County, IL

Zip Code 62858

Positioned in Clay County in south-central Illinois, Louisville sits on Pennsylvanian-era coal measures that can produce moderate radon levels. Testing data for this rural community remains limited, making professional radon testing particularly important for homeowners. The area's older farmhouses and newer rural residences in zip code 62858 may show varying radon entry patterns based on foundation types.

6.50

pCi/L area average

Above EPA Action Level

Nearby homeowner readings average 6.50 pCi/L, based on 12 tests from 7 nearby cities. No readings have been submitted for Louisville 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+

Louisville, 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 Louisville, IL

No homeowner tests have been submitted for Louisville 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
Effingham	24.4 mi	4.33 pCi/L	3
Kell	28.2 mi	5.00 pCi/L	1
Mount Vernon	38.3 mi	4.00 pCi/L	1
Bridgeport	40.2 mi	5.00 pCi/L	1
Mount Carmel	45.8 mi	5.00 pCi/L	2
Carlyle	48.5 mi	13.00 pCi/L	1
Mattoon	49.4 mi	9.33 pCi/L	3

Clay County Radon Profile

EPA mapping assigns Clay 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 Clay 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 Clay County home regardless of zone or a neighbor's results.

Radon FAQ for Louisville, IL

What EPA Radon Zone is Louisville in?

Louisville and the 62858 zip code are in Clay 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 Louisville?

No homeowner radon tests have been submitted for Louisville yet. Because radon is driven by regional soil and bedrock geology, readings from the closest cities—and the Clay County average—are the best available indicator of local conditions until Louisville 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 Louisville?

Radon mitigation in Louisville 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 Louisville?

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.