Mascoutah, IL Radon Levels
Check local Mascoutah radon levels and find certified testing and mitigation professionals to keep your home safe
Mascoutah, IL Radon Facts
Positioned in St. Clair County on the Illinois side of the St. Louis metro, Mascoutah sits atop Mississippi River floodplain deposits that contribute to moderate radon levels throughout the region. Local testing shows an average indoor radon concentration of 6.5 pCi/L, which exceeds the EPA's 4.0 pCi/L action threshold and warrants mitigation consideration. The combination of alluvial soils over limestone bedrock makes zip code 62258 particularly susceptible to radon entry through basement foundations and floor slabs.
Based on 2 user-submitted radon tests for homes in Mascoutah, IL. The EPA recommends taking action at or above 4.0 pCi/L.
Mascoutah, IL Radon Mitigation
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Mascoutah, IL Radon Levels
User-submitted radon test readings from homes in the Mascoutah area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 5 pCi/L | Mascoutah, IL | 0-20 Years | Full Basement |
| 8 pCi/L | MASCOUTAH, IL | 0-20 Years | Full Basement |
Have a radon test result for Mascoutah? Submit your reading to help other homeowners.
Radon Readings Near Mascoutah, IL
Compare radon levels in Mascoutah with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| O Fallon | 8.9 mi | 6.00 pCi/L | 1 |
| Lebanon | 9.1 mi | 10.50 pCi/L | 2 |
| Belleville | 11.9 mi | 7.33 pCi/L | 3 |
| Fairview Heights | 14.5 mi | 9.00 pCi/L | 1 |
| Marissa | 16.0 mi | 4.00 pCi/L | 1 |
| Caseyville | 16.5 mi | 7.50 pCi/L | 2 |
| Troy | 17.8 mi | 4.00 pCi/L | 1 |
| Collinsville | 18.0 mi | 5.00 pCi/L | 1 |
St Clair County Radon Profile
EPA mapping assigns St Clair County to Radon Zone 2, indicating moderate predicted indoor screening levels in the 2 to 4 pCi/L range based on regional geology. Homeowner-submitted tests from 7 cities in St Clair County average 7.50 pCi/L across 12 tests — above the EPA's 4 pCi/L action level, reinforcing the need for testing across the county. As the second leading cause of lung cancer in the U.S., radon warrants testing in every St Clair County home regardless of zone or a neighbor's results.