Waterloo, IL Radon Levels
Check local Waterloo radon levels and find certified testing and mitigation professionals to keep your home safe
Waterloo, IL Radon Facts
Located in Monroe County on the Illinois side of the St. Louis Metro, Waterloo demonstrates an elevated average radon level of 9.17 pCi/L, well above EPA guidelines. The area's Mississippi River floodplain deposits over limestone bedrock, combined with the region's basement-heavy housing stock, create conditions highly conducive to radon accumulation.
Based on 5 user-submitted radon tests for homes in Waterloo, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Waterloo, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Waterloo, IL Radon Levels
User-submitted radon test readings from homes in the Waterloo area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 9 pCi/L | Waterloo, IL | — | — |
| 14 pCi/L | Waterloo, IL | 21-50 Years | Partial Basement |
| 7 pCi/L | Waterloo, IL | — | — |
Have a radon test result for Waterloo? Submit your reading to help other homeowners.
Radon Readings Near Waterloo, IL
Compare radon levels in Waterloo with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Columbia | 8.2 mi | 8.00 pCi/L | 4 |
| Belleville | 16.8 mi | 7.33 pCi/L | 3 |
| Fairview Heights | 20.4 mi | 9.00 pCi/L | 1 |
| O Fallon | 22.0 mi | 6.00 pCi/L | 1 |
| Mascoutah | 22.2 mi | 6.50 pCi/L | 2 |
| Marissa | 22.2 mi | 4.00 pCi/L | 1 |
| Caseyville | 22.8 mi | 7.50 pCi/L | 2 |
| Collinsville | 26.5 mi | 5.00 pCi/L | 1 |
Monroe County Radon Profile
EPA mapping assigns Monroe County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 2 cities in Monroe County average 8.67 pCi/L across 9 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every Monroe County home regardless of zone or a neighbor's results.