O Fallon, IL Radon Mitigation and Testing

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

Based on 1 user-submitted tests, the average radon level is 6.00 pCi/L.

Q: What EPA Radon Zone is O Fallon in?

O Fallon is in St Clair County, EPA Zone 2.

Q: How much does radon mitigation cost in O Fallon?

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

Avg: 6.00 pCi/L

St Clair County

EPA Zone 2

1 user test

O Fallon is located in St Clair County, Illinois. With 1 user-submitted readings averaging 6.00 pCi/L, the area exceeds the EPA's 4.0 pCi/L action threshold, and testing is strongly recommended for homeowners in the 62269 zip code.

6.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

O Fallon, IL Radon Mitigation

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

O Fallon, IL Radon Testing

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

O Fallon, Illinois Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
6 pCi/L	O Fallon, IL	0-20 Years	Full Basement	Nov 2021

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

O Fallon Radon Facts

Key details about the radon risk profile for O Fallon and the 62269 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

St Clair County, IL

Zip Code

62269

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

6.00 pCi/L

User Tests Submitted

O Fallon and the 62269 zip code are located in St Clair 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 O Fallon, IL

What is the average radon level in O Fallon, IL?

Based on 1 user-submitted test, the average radon level in O Fallon is 6.00 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 O Fallon in?

O Fallon and the 62269 zip code are in St Clair 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 O Fallon?

Radon mitigation in O Fallon 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 O Fallon?

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