O Fallon, MO Radon Levels
Check local O Fallon radon levels and find certified testing and mitigation professionals to keep your home safe
O Fallon, MO Radon Facts
O'Fallon residents in St. Charles County face significantly elevated radon levels, with local testing showing an average of 8.67 pCi/L across zip codes 63366 and 63368. These readings substantially exceed EPA action thresholds, likely reflecting the area's limestone bedrock and glacial deposits common throughout the St. Louis Metro region. Given these elevated levels and the community's suburban housing stock with full basements, professional radon mitigation is strongly recommended for affected properties.
Based on 4 user-submitted radon tests for homes in O Fallon, MO. The EPA recommends taking action at or above 4.0 pCi/L.
O Fallon, MO Radon Mitigation
Professional radon mitigation is the most effective way to permanently lower radon levels and protect your household.
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O Fallon, MO Radon Levels
User-submitted radon test readings from homes in the O Fallon area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 14 pCi/L | O Fallon, MO | 21-50 Years | Full Basement |
| 5 pCi/L | O Fallon, MO | 0-20 Years | Full Basement |
| 7 pCi/L | O Fallon, MO | 0-20 Years | Full Basement |
Have a radon test result for O Fallon? Submit your reading to help other homeowners.
Radon Readings Near O Fallon, MO
Compare radon levels in O Fallon with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Lake Saint Louis | 2.7 mi | 5.00 pCi/L | 2 |
| Saint Peters | 6.1 mi | 7.00 pCi/L | 1 |
| Saint Charles | 9.6 mi | 5.00 pCi/L | 1 |
| Chesterfield | 13.4 mi | 5.00 pCi/L | 1 |
| Ballwin | 17.0 mi | 4.00 pCi/L | 1 |
| Troy | 19.1 mi | 8.50 pCi/L | 4 |
| Hazelwood | 19.9 mi | 20.00 pCi/L | 1 |
| Labadie | 20.0 mi | 4.00 pCi/L | 1 |
St Charles County Radon Profile
A specific EPA radon zone has not been established for St Charles County, which is why testing is advised for all homes here irrespective of geology. Homeowner-submitted tests from 5 cities in St Charles County average 6.63 pCi/L across 8 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 St Charles County to test, as levels can differ between neighboring homes.