Charleston, IL Radon Mitigation and Testing

Q: What is the average radon level in Charleston, IL?

Based on 1 user-submitted tests, the average radon level is 8.00 pCi/L.

Q: What EPA Radon Zone is Charleston in?

Charleston is in Coles County, EPA Zone 1.

Q: How much does radon mitigation cost in Charleston?

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

Avg: 8.00 pCi/L

Coles County

EPA Zone 1

1 user test

Charleston is located in Coles County, Illinois. With 1 user-submitted readings averaging 8.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 61920 zip code.

8.00

pCi/L average

Above EPA Action Level

Based on 1 user-submitted radon test for homes in Charleston, IL. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Charleston, IL Radon Mitigation

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

Charleston, IL Radon Testing

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

Charleston, Illinois Radon Levels

User-submitted radon test readings from homes in the Charleston area.

Radon Level	City	Home Age	Foundation	Submitted
8 pCi/L	Charleston, IL	21-50 Years	Full Basement	Jan 2024

Have a radon test result for Charleston? Submit your reading to help other homeowners.

Charleston Radon Facts

Key details about the radon risk profile for Charleston and the 61920 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Coles County, IL

Zip Code

61920

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

8.00 pCi/L

User Tests Submitted

Charleston and the 61920 zip code are located in Coles 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 Charleston, IL

What is the average radon level in Charleston, IL?

Based on 1 user-submitted test, the average radon level in Charleston is 8.00 pCi/L. This exceeds the EPA's recommended action level of 4.0 pCi/L, and radon testing is recommended for all homes in the area.

What EPA Radon Zone is Charleston in?

Charleston and the 61920 zip code are in Coles 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 Charleston?

Radon mitigation in Charleston 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 Charleston?

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