Walnut Hill, IL Radon Levels

Q: What EPA Radon Zone is Walnut Hill in?

Walnut Hill is in Marion County, EPA Zone 2.

Q: How much does radon mitigation cost in Walnut Hill?

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

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

Walnut Hill, IL Radon Facts

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

County Marion County, IL

Zip Code 62893

Found in Marion County in south-central Illinois (ZIP 62893), Walnut Hill sits within the Pennsylvanian coal measures that characterize this region of the Illinois Basin. Though specific radon testing data is not currently available for this small community, the area's coal-bearing shale and sandstone formations typically produce moderate radon conditions. Given Marion County's geological characteristics and the potential for radon accumulation in homes with basements, residents should consider testing.

5.00

pCi/L area average

Above EPA Action Level

Marion County average: 5.00 pCi/L, based on 1 user-submitted test across 1 city in the county. No homeowner readings have been submitted for Walnut Hill itself yet, so this county figure is the closest available benchmark. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Walnut Hill, 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 Walnut Hill, IL

No homeowner tests have been submitted for Walnut Hill 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
Kell	7.3 mi	5.00 pCi/L	1
Mount Vernon	12.3 mi	4.00 pCi/L	1
Carlyle	21.1 mi	13.00 pCi/L	1
Highland	40.4 mi	6.00 pCi/L	1
Mascoutah	40.8 mi	6.50 pCi/L	2
Marissa	41.8 mi	4.00 pCi/L	1
Lebanon	42.5 mi	10.50 pCi/L	2
O Fallon	47.2 mi	6.00 pCi/L	1

Marion County Radon Profile

EPA mapping assigns Marion County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 1 city in Marion County average 5.00 pCi/L across 1 test — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Marion County home regardless of zone or a neighbor's results.

Radon FAQ for Walnut Hill, IL

What EPA Radon Zone is Walnut Hill in?

Walnut Hill and the 62893 zip code are in Marion 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 Walnut Hill?

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

Radon mitigation in Walnut Hill 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 Walnut Hill?

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.