Radon Mitigation in Philadelphia
Elevated radon potential across Philadelphia's three-belt geology — Wissahickon Schist and southern Piedmont metamorphic bedrock under central neighborhoods, northern Piedmont limestone and sandstone along the county's western edge, and Coastal Plain sediments overlying older rocks toward the rivers. Buried stream valleys and limestone-prone pockets add localized variability.
Lower Radon Risk Area — Testing Still Recommended
Philadelphia is in EPA Zone 3 — Elevated radon potential across Philadelphia's three-belt geology — Wissahickon Schist and southern Piedmont metamorphic bedrock under central neighborhoods, northern Piedmont limestone and sandstone along the county's western edge, and Coastal Plain sediments overlying older rocks toward the rivers. Buried stream valleys and limestone-prone pockets add localized variability.
Local Geology & Risk Factors
Philadelphia is located in an area with Piedmont / Coastal Plain Transition geology, which contributes to elevated radon levels. The Pennsylvania DEP identifies this region as having significant radon potential due to uranium-bearing rock formations.
Testing is essential because radon levels can vary significantly between neighboring homes based on construction, soil permeability, and ventilation.
See Pennsylvania radon levels and EPA radon zone classifications →
Quick Facts
Basement, Slab, Crawlspace installations available
Most systems installed in 1-2 days
5-10 year warranties on parts and labor
99% effectiveness in reducing radon
Why Choose Certified Pros?
- DEP-certified and insured
- Proper system design and installation
- Post-installation testing included
- Meet all DEP requirements
Verify Contractor Certification — PA DEP Official Directory for Philadelphia, Philadelphia County
View PA DEP Certified Contractor DirectoryThe PA Department of Environmental Protection maintains the official list of certified radon testers and mitigators, sorted by county and updated monthly. Always verify certification before hiring any contractor.
Directory resource provided by PA DEP Bureau of Radiation Protection, Radon Division.
Request Radon Information for Philadelphia
Submit your request and we will connect you with a DEP-certified professional serving Philadelphia County.
DEP-Certified Pros in Philadelphia
Find a DEP-Certified Contractor in Philadelphia
PA DEP maintains the official directory of certified radon testers and mitigators, updated monthly. Always verify certification before hiring.
Search the PA DEP Directory →PA Radon Testing Requirements
Under PA Code § 240, all radon testing and mitigation professionals operating in Pennsylvania must hold active DEP certification. Request your contractor's certification number and verify it independently before work begins.
PA DEP Radon Division →EPA Action Level: 4 pCi/L
The EPA recommends mitigation for any home testing at or above 4 pCi/L. Philadelphia area homes with Piedmont / Coastal Plain Transition geology are at elevated risk. Short-term tests take 48–96 hours; long-term tests run 90 days for greater accuracy.
Pennsylvania Radon Risk Guide →Pennsylvania Radon Guides
Share Your Radon Test Result
Help other Philadelphia homeowners understand local radon risk. Your anonymous reading contributes to our community dataset.
Readings are anonymous and used for informational purposes only. We do not store personal information from this form.
Not ready to submit? You can also go directly to the PA DEP directory.
Search the PA DEP Certified Contractor Directory →