Illiopolis, IL Radon Levels

Q: What EPA Radon Zone is Illiopolis in?

Illiopolis is in Sangamon County, EPA Zone 1.

Q: How much does radon mitigation cost in Illiopolis?

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

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

Illiopolis, IL Radon Facts

EPA Radon Zone Zone 1 — High Risk > 4.0 pCi/L (Zone 1)

County Sangamon County, IL

Zip Code 62539

Centrally located in Sangamon County within the Springfield Metro area, Illiopolis sits on deep glacial moraine deposits over limestone bedrock that contribute to moderate-to-high radon potential. Testing data for this 62539 zip code community remains limited, though the central Illinois prairie region's geological characteristics warrant careful attention. Homeowners with full basements should prioritize radon testing given the area's glacial till and underlying limestone formations.

5.00

pCi/L area average

Above EPA Action Level

Sangamon County average: 5.00 pCi/L, based on 6 user-submitted tests across 5 cities in the county. No homeowner readings have been submitted for Illiopolis 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+

Illiopolis, 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 Illiopolis, IL

No homeowner tests have been submitted for Illiopolis 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
Williamsville	17.3 mi	1.00 pCi/L	1
Moweaqua	19.9 mi	7.00 pCi/L	1
Taylorville	20.9 mi	2.00 pCi/L	1
Springfield	21.7 mi	6.50 pCi/L	2
Chatham	27.3 mi	3.00 pCi/L	1
Divernon	29.2 mi	7.00 pCi/L	1
Lincolns New Salem	31.0 mi	8.00 pCi/L	1
Auburn	31.7 mi	6.00 pCi/L	1

Sangamon County Radon Profile

Sangamon County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 5 cities in Sangamon County average 5.00 pCi/L across 6 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Sangamon County to test, as levels can differ between neighboring homes.

Radon FAQ for Illiopolis, IL

What EPA Radon Zone is Illiopolis in?

Illiopolis and the 62539 zip code are in Sangamon 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.

Why are radon readings shown from areas near Illiopolis?

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

Radon mitigation in Illiopolis 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 Illiopolis?

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.