Columbia, IL Radon Mitigation and Testing
Located in Monroe County on the Illinois side of the St. Louis metropolitan area, Columbia sits on Mississippi River bluff deposits and underlying limestone that contribute to elevated radon levels. Testing data shows an average reading of 8.0 pCi/L, well above the EPA action threshold and reflecting the area's geological complexity. The 62236 zip code features many homes with full basements typical of Midwest construction, creating enclosed spaces where radon accumulates most readily.
Based on 4 user-submitted radon tests for homes in Columbia, IL. The EPA recommends taking action at or above 4.0 pCi/L.
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.
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
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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 |