Illiopolis, IL Radon Mitigation and Testing

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.

Sangamon County

EPA Zone 1

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.

Illiopolis, IL Radon Mitigation

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

Illiopolis, IL Radon Testing

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

Illiopolis Radon Facts

Key details about the radon risk profile for Illiopolis and the 62539 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Sangamon County, IL

Zip Code

62539

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Illiopolis and the 62539 zip code are located in Sangamon County, which has an EPA assigned Radon Zone of 1. A radon zone of 1 predicts an average indoor radon screening level greater than 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

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.

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.

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