Williamsville, IL Radon Levels
Check local Williamsville radon levels and find certified testing and mitigation professionals to keep your home safe
Williamsville, IL Radon Facts
Based in Sangamon County within the Springfield Metro area, Williamsville recorded an average radon level of 1.0 pCi/L from limited testing data. While this reading falls well within EPA recommended ranges, the glacial moraine deposits and underlying limestone bedrock common to central Illinois can create variable radon conditions across different properties. Residents should still conduct individual testing, as local soil conditions and home construction factors can influence radon accumulation regardless of community averages.
Based on 1 user-submitted radon test for homes in Williamsville, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Williamsville, IL Radon Mitigation
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Williamsville, IL Radon Levels
User-submitted radon test readings from homes in the Williamsville area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 1 pCi/L | Williamsville, IL | 21-50 Years | Full Basement |
Have a radon test result for Williamsville? Submit your reading to help other homeowners.
Radon Readings Near Williamsville, IL
Compare radon levels in Williamsville with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Springfield | 12.6 mi | 6.50 pCi/L | 2 |
| Lincolns New Salem | 13.7 mi | 8.00 pCi/L | 1 |
| Chatham | 21.2 mi | 3.00 pCi/L | 1 |
| Auburn | 27.1 mi | 6.00 pCi/L | 1 |
| Divernon | 27.3 mi | 7.00 pCi/L | 1 |
| Taylorville | 31.1 mi | 2.00 pCi/L | 1 |
| Moweaqua | 36.2 mi | 7.00 pCi/L | 1 |
| Jacksonville | 39.2 mi | 9.00 pCi/L | 2 |
Sangamon County Radon Profile
Sangamon County falls in EPA Radon Zone 1, meaning the local uranium-bearing geology is predicted to drive average indoor radon screening levels above the EPA's 4 pCi/L action threshold. Homeowner-submitted tests from 5 cities in Sangamon County average 5.00 pCi/L across 6 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 Sangamon County to test, as levels can differ between neighboring homes.