Horsham, PA Radon Levels
Check local Horsham radon levels and find certified testing and mitigation professionals to keep your home safe
Horsham, PA Radon Facts
Part of the Philadelphia Metro area in Montgomery County, Horsham shows extremely high radon activity with a reading of 20.0 pCi/L from recent testing. This level far exceeds the EPA's 4.0 pCi/L action level, reflecting the area's complex geology of Triassic-Jurassic bedrock formations known for elevated radon production. Residents in ZIP code 19044 should prioritize immediate radon testing and mitigation, particularly given the prevalence of basement-equipped homes in this suburban Philadelphia community.
Based on 1 user-submitted radon test for homes in Horsham, PA. The EPA recommends taking action at or above 4.0 pCi/L.
Horsham, PA Radon Mitigation
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Horsham, PA Radon Levels
User-submitted radon test readings from homes in the Horsham area.
| Radon Level | City | Home Age | Foundation |
|---|---|---|---|
| 20 pCi/L | Horsham, PA | 0-20 Years | Full Basement |
Have a radon test result for Horsham? Submit your reading to help other homeowners.
Radon Readings Near Horsham, PA
Compare radon levels in Horsham with the closest nearby cities that have user-submitted test data.
| City | Distance | Avg User Level | Readings |
|---|---|---|---|
| Warminster | 3.5 mi | 11.00 pCi/L | 3 |
| Ambler | 3.6 mi | 4.00 pCi/L | 1 |
| Abington | 4.4 mi | 8.00 pCi/L | 1 |
| Glenside | 5.0 mi | 7.00 pCi/L | 1 |
| Jenkintown | 6.2 mi | 7.00 pCi/L | 1 |
| North Wales | 6.2 mi | 7.00 pCi/L | 1 |
| Wyncote | 6.6 mi | 20.00 pCi/L | 1 |
| Elkins Park | 7.5 mi | 10.67 pCi/L | 3 |
Montgomery County Radon Profile
Because of its underlying geology, Montgomery County is mapped as EPA Radon Zone 1 — the most elevated classification — where predicted indoor screening averages exceed 4 pCi/L. Homeowner-submitted tests from 16 cities in Montgomery County average 8.41 pCi/L across 17 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 Montgomery County home regardless of zone or a neighbor's results.