Highland, IL Radon Levels
Check local Highland radon levels and find certified testing and mitigation professionals to keep your home safe
Highland, IL Radon Facts
Situated in Madison County on the Illinois side of the St. Louis Metro area, Highland recorded an average radon level of 6.0 pCi/L based on initial testing. This reading exceeds the EPA action level of 4.0 pCi/L, reflecting the area's Mississippi River floodplain deposits over underlying limestone bedrock that can contribute to elevated indoor radon accumulation.
Based on 1 user-submitted radon test for homes in Highland, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Highland, IL Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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Highland, IL Radon Levels
User-submitted radon test readings from homes in the Highland area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 6 pCi/L | Highland, IL | 0-20 Years | Full Basement |
Have a radon test result for Highland? Submit your reading to help other homeowners.
Radon Readings Near Highland, IL
Compare radon levels in Highland with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Troy | 10.7 mi | 4.00 pCi/L | 1 |
| Lebanon | 12.7 mi | 10.50 pCi/L | 2 |
| Glen Carbon | 15.7 mi | 2.50 pCi/L | 2 |
| Maryville | 15.8 mi | 11.00 pCi/L | 1 |
| Collinsville | 17.4 mi | 5.00 pCi/L | 1 |
| O Fallon | 17.6 mi | 6.00 pCi/L | 1 |
| Staunton | 18.2 mi | 8.00 pCi/L | 1 |
| Carlyle | 19.4 mi | 13.00 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.