Troy, IL Radon Levels
Check local Troy radon levels and find certified testing and mitigation professionals to keep your home safe
Troy, IL Radon Facts
Positioned on the Illinois side of the St. Louis metropolitan area, Troy in Madison County shows an average radon level of 4.0 pCi/L. Mississippi River floodplain deposits and underlying Mississippian limestone create moderate radon potential, and while current readings meet EPA recommendations, regular testing remains advisable for all area homes.
Based on 1 user-submitted radon test for homes in Troy, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Troy, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Troy, IL Radon Levels
User-submitted radon test readings from homes in the Troy area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 4 pCi/L | Troy, IL | 0-20 Years | Full Basement |
Have a radon test result for Troy? Submit your reading to help other homeowners.
Radon Readings Near Troy, IL
Compare radon levels in Troy with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Maryville | 5.2 mi | 11.00 pCi/L | 1 |
| Glen Carbon | 5.9 mi | 2.50 pCi/L | 2 |
| Collinsville | 6.8 mi | 5.00 pCi/L | 1 |
| Lebanon | 9.1 mi | 10.50 pCi/L | 2 |
| Caseyville | 9.9 mi | 7.50 pCi/L | 2 |
| O Fallon | 10.6 mi | 6.00 pCi/L | 1 |
| Highland | 10.7 mi | 6.00 pCi/L | 1 |
| Fairview Heights | 11.5 mi | 9.00 pCi/L | 1 |
Madison County Radon Profile
The soils and bedrock of Madison County place it in EPA Radon Zone 2, a moderate-risk classification with predicted indoor averages of 2 to 4 pCi/L. Homeowner-submitted tests from 8 cities in Madison County average 5.44 pCi/L across 9 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. Since radon is the second leading cause of lung cancer nationally, the EPA urges every household in Madison County to test, as levels can differ between neighboring homes.