Normal, IL Radon Mitigation and Testing

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

Based on 4 user-submitted tests, the average radon level is 7.30 pCi/L.

Q: What EPA Radon Zone is Normal in?

Normal is in McLean County, EPA Zone 1.

Q: How much does radon mitigation cost in Normal?

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

Avg: 7.30 pCi/L

McLean County

EPA Zone 1

4 user tests

Home to Illinois State University in McLean County, Normal sits within the central Illinois prairie region where deep glacial moraine deposits over limestone bedrock contribute to elevated radon potential. Local testing shows an average radon level of 7.25 pCi/L, significantly exceeding the EPA action level of 4.0 pCi/L and underscoring the need for radon testing and mitigation in this Bloomington Metro community.

7.30

pCi/L average

Above EPA Action Level

Based on 4 user-submitted radon tests for homes in Normal, IL. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Normal, IL Radon Mitigation

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

Normal, IL Radon Testing

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

Normal, Illinois Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
9 pCi/L	Normal, IL	51-99 Years	Full Basement	Feb 2024
5 pCi/L	Normal, IL	51-99 Years	Full Basement	Feb 2022
7 pCi/L	Normal, IL	0-20 Years	Full Basement	Nov 2020
8 pCi/L	Normal, IL	0-20 Years	Full Basement	Sep 2020

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

Normal Radon Facts

Key details about the radon risk profile for Normal and the 61761 zip code area.

EPA Radon Zone

Zone 1 — High Risk

County

McLean County, IL

Zip Code

61761

Predicted Screening Level

> 4.0 pCi/L (Zone 1)

Avg. User Submitted Level

7.30 pCi/L

User Tests Submitted

Normal and the 61761 zip code are located in McLean 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 Normal, IL

What is the average radon level in Normal, IL?

Based on 4 user-submitted tests, the average radon level in Normal is 7.30 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 Normal in?

Normal and the 61761 zip code are in McLean 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 Normal?

Radon mitigation in Normal 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 Normal?

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