Collinsville, IL Radon Levels
Check local Collinsville radon levels and find certified testing and mitigation professionals to keep your home safe
Collinsville, IL Radon Facts
Located in Madison County on the Illinois side of the St. Louis metropolitan area, Collinsville sits atop Mississippi River floodplain deposits and underlying Mississippian limestone that create moderate radon potential. The city's average radon level of 5.0 pCi/L exceeds the EPA action level, based on testing data from zip code 62234. Homeowners should prioritize professional radon testing, especially in homes with basements or crawl spaces near the limestone bluffs.
Based on 1 user-submitted radon test for homes in Collinsville, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Collinsville, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Collinsville, IL Radon Levels
User-submitted radon test readings from homes in the Collinsville area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 5 pCi/L | Collinsville, IL | 0-20 Years | Full Basement |
Have a radon test result for Collinsville? Submit your reading to help other homeowners.
Radon Readings Near Collinsville, IL
Compare radon levels in Collinsville with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Maryville | 2.3 mi | 11.00 pCi/L | 1 |
| Caseyville | 3.7 mi | 7.50 pCi/L | 2 |
| Glen Carbon | 5.4 mi | 2.50 pCi/L | 2 |
| Fairview Heights | 6.2 mi | 9.00 pCi/L | 1 |
| Troy | 6.8 mi | 4.00 pCi/L | 1 |
| Granite City | 7.4 mi | 8.00 pCi/L | 1 |
| O Fallon | 9.1 mi | 6.00 pCi/L | 1 |
| Belleville | 10.4 mi | 7.33 pCi/L | 3 |
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.