Columbia, IL Radon Mitigation and Testing

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

Based on 4 user-submitted tests, the average radon level is 8.00 pCi/L.

Q: What EPA Radon Zone is Columbia in?

Columbia is in Monroe County, EPA Zone 2.

Q: How much does radon mitigation cost in Columbia?

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

Monroe County

EPA Zone 2

4 user tests

Columbia is located in Monroe County, Illinois. With 4 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 62236 zip code.

8.00

pCi/L average

Above EPA Action Level

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

4.0 EPA

10+

Columbia, IL Radon Mitigation

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

Columbia, IL Radon Testing

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

Columbia, Illinois Radon Levels

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

Radon Level	City	Home Age	Foundation	Submitted
4 pCi/L	Columbia, IL	21-50 Years	Partial Basement	Jul 2024
10 pCi/L	Columbia, IL	0-20 Years	Full Basement	Dec 2020
9 pCi/L	Columbia, IL	—	—	Mar 2020

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

Columbia Radon Facts

Key details about the radon risk profile for Columbia and the 62236 zip code area.

EPA Radon Zone

Zone 2 — Moderate Risk

County

Monroe County, IL

Zip Code

62236

Predicted Screening Level

2–4 pCi/L (Zone 2)

Avg. User Submitted Level

8.00 pCi/L

User Tests Submitted

Columbia and the 62236 zip code are located in Monroe 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 Columbia, IL

What is the average radon level in Columbia, IL?

Based on 4 user-submitted tests, the average radon level in Columbia 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 Columbia in?

Columbia and the 62236 zip code are in Monroe 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 Columbia?

Radon mitigation in Columbia 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 Columbia?

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