Joliet, IL Radon Mitigation and Testing

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

Based on 3 user-submitted tests, the average radon level is 6.70 pCi/L.

Q: What EPA Radon Zone is Joliet in?

Joliet is in Will County, EPA Zone 2.

Q: How much does radon mitigation cost in Joliet?

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

Avg: 6.70 pCi/L

Will County

EPA Zone 2

3 user tests

Positioned in Will County within the southern suburban reaches of the Chicago metro, Joliet's radon levels average 6.67 pCi/L - exceeding the EPA action threshold of 4.0 pCi/L. The area's glacial till deposits over limestone bedrock, combined with predominantly postwar housing featuring full poured-concrete basements in zip code 60431, create conditions highly favorable for radon accumulation.

6.70

pCi/L average

Above EPA Action Level

Based on 3 user-submitted radon tests for homes in Joliet, IL. The EPA recommends taking action at or above 4.0 pCi/L.

4.0 EPA

10+

Joliet, IL Radon Mitigation

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

Joliet, IL Radon Testing

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

Joliet, Illinois Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
5 pCi/L	Joliet, IL	21-50 Years	Partial Basement	May 2020
8 pCi/L	Joliet, IL	0-20 Years	No Basement/All Slab	Oct 2018
7 pCi/L	Joliet, IL	21-50 Years	Full Basement	Oct 2018

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

Joliet Radon Facts

Key details about the radon risk profile for Joliet and the 60431 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Will County, IL

Zip Code

60431

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

6.70 pCi/L

User Tests Submitted

Joliet and the 60431 zip code are located in Will County, which has an EPA assigned Radon Zone of 2. A radon zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L. The EPA recommends testing every home regardless of zone classification.

Radon FAQ for Joliet, IL

What is the average radon level in Joliet, IL?

Based on 3 user-submitted tests, the average radon level in Joliet is 6.70 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 Joliet in?

Joliet and the 60431 zip code are in Will County, which has an EPA assigned Radon Zone of 2. A zone of 2 predicts an average indoor radon screening level between 2 and 4 pCi/L.

How much does radon mitigation cost in Joliet?

Radon mitigation in Joliet 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 Joliet?

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