Philadelphia, PA Radon Levels
Check local Philadelphia radon levels and find certified testing and mitigation professionals to keep your home safe
Philadelphia, PA Radon Facts
America's historic city spans Philadelphia County and Delaware County within the Philadelphia Metro area, where complex urban geology and diverse housing create variable radon conditions. Current testing shows an average radon level of 8.0 pCi/L, which exceeds the EPA action threshold of 4.0 pCi/L and requires immediate attention. The city's vast housing stock, from colonial-era rowhomes to modern high-rises, presents unique radon challenges across multiple zip codes.
Based on 4 user-submitted radon tests for homes in Philadelphia, PA. The EPA recommends taking action at or above 4.0 pCi/L.
Philadelphia, PA Radon Mitigation
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Philadelphia, PA Radon Levels
User-submitted radon test readings from homes in the Philadelphia area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 4 pCi/L | Philadelphia, PA | 100+ Years | Full Basement |
| 6 pCi/L | Philadelphia, PA | 51-99 Years | — |
| 14 pCi/L | Philadelphia, PA | 100+ Years | Full Basement |
| 8 pCi/L | Philadelphia, PA | 51-99 Years | Full Basement |
Have a radon test result for Philadelphia? Submit your reading to help other homeowners.
Radon Readings Near Philadelphia, PA
Compare radon levels in Philadelphia with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Bala Cynwyd | 4.6 mi | 1.00 pCi/L | 1 |
| Elkins Park | 5.7 mi | 10.67 pCi/L | 3 |
| Wyncote | 6.4 mi | 20.00 pCi/L | 1 |
| Lansdowne | 7.2 mi | 4.00 pCi/L | 1 |
| Jenkintown | 7.5 mi | 7.00 pCi/L | 1 |
| Ardmore | 7.8 mi | 6.00 pCi/L | 2 |
| Glenside | 8.0 mi | 7.00 pCi/L | 1 |
| Drexel Hill | 8.7 mi | 2.50 pCi/L | 2 |
Philadelphia County Radon Profile
Local geology places Philadelphia County in EPA Radon Zone 3, where predicted indoor radon averages fall below 2 pCi/L — though no county is risk-free. Homeowner-submitted tests from 1 city in Philadelphia County average 8.00 pCi/L across 4 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 Philadelphia County to test, as levels can differ between neighboring homes.