Granite City, IL Radon Levels
Check local Granite City radon levels and find certified testing and mitigation professionals to keep your home safe
Granite City, IL Radon Facts
Located on the Illinois side of the St. Louis metro in Madison County, Granite City recorded an average radon level of 8.0 pCi/L from initial testing, significantly exceeding EPA action levels. The community's Mississippi River floodplain deposits over underlying Mississippian limestone create variable radon conditions throughout zip code 62040. With its mix of mid-century homes and slab-on-grade construction, residents should prioritize professional radon testing and mitigation.
Based on 1 user-submitted radon test for homes in Granite City, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Granite City, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Granite City, IL Radon Levels
User-submitted radon test readings from homes in the Granite City area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 8 pCi/L | Granite City, IL | 0-20 Years | Full Basement |
Have a radon test result for Granite City? Submit your reading to help other homeowners.
Radon Readings Near Granite City, IL
Compare radon levels in Granite City with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Collinsville | 7.4 mi | 5.00 pCi/L | 1 |
| Maryville | 7.9 mi | 11.00 pCi/L | 1 |
| Glen Carbon | 7.9 mi | 2.50 pCi/L | 2 |
| Caseyville | 8.2 mi | 7.50 pCi/L | 2 |
| Fairview Heights | 10.6 mi | 9.00 pCi/L | 1 |
| East Alton | 10.8 mi | 4.00 pCi/L | 1 |
| Troy | 12.9 mi | 4.00 pCi/L | 1 |
| Belleville | 14.7 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.