Knoxville, IL Radon Mitigation and Testing

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

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

Q: What EPA Radon Zone is Knoxville in?

Knoxville is in Knox County, EPA Zone 1.

Q: How much does radon mitigation cost in Knoxville?

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

Knox County

EPA Zone 1

1 user test

Located in Knox County in western Illinois, Knoxville has recorded an average radon level of 8.0 pCi/L, which exceeds the EPA's action level of 4.0 pCi/L. This agricultural community in zip code 61448 sits on glacial deposits over limestone bedrock, geological conditions that contribute to radon production and migration into homes with basements common throughout rural Illinois.

8.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Knoxville, IL Radon Mitigation

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

Knoxville, IL Radon Testing

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

Knoxville, Illinois Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
8 pCi/L	Knoxville, IL	51-99 Years	Full Basement	Oct 2024

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

Knoxville Radon Facts

Key details about the radon risk profile for Knoxville and the 61448 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

Knox County, IL

Zip Code

61448

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

8.00 pCi/L

User Tests Submitted

Knoxville and the 61448 zip code are located in Knox 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 Knoxville, IL

What is the average radon level in Knoxville, IL?

Based on 1 user-submitted test, the average radon level in Knoxville 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 Knoxville in?

Knoxville and the 61448 zip code are in Knox 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 Knoxville?

Radon mitigation in Knoxville 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 Knoxville?

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