What This Means for Philadelphia Homeowners
Philadelphia County, PA is classified as EPA Radon Zone 1, indicating high radon risk. Indoor radon levels in Philadelphia homes average 5.1 pCi/L.
⚠️ High Risk Area - Testing Strongly Recommended
The EPA recommends that all homes in Zone 1 areas be tested for radon. Average levels above 4 pCi/L mean a significant percentage of Philadelphia homes require mitigation.
Understanding EPA Radon Zones
The EPA predicts average indoor radon levels above 4 pCi/L in Zone 1 counties. This is the highest radon risk classification.
EPA Radon Zone Classification:
Zone 1 (Highest Potential)
Predicted: >4 pCi/LCounties with highest radon potential. EPA recommends testing and mitigation if levels exceed 4 pCi/L.
Zone 2 (Moderate Potential)
Predicted: 2-4 pCi/LModerate radon levels. Many homes still test above action level. Testing recommended.
Zone 3 (Low Potential)
Predicted: <2 pCi/LLower average levels, but high radon possible in individual homes. Testing still recommended.
Why Philadelphia Has High Radon Risk
Philadelphia sits in a geographic region with uranium-rich soil and bedrock. As uranium naturally decays, it releases radon gas that seeps into homes through foundation cracks, sump pits, and construction joints.
Common Radon Entry Points in Philadelphia Homes:
- • Foundation cracks: Settling over time creates pathways for radon gas
- • Sump pump pits: Direct opening to soil beneath your home
- • Construction joints: Gaps where walls meet floors
- • Utility penetrations: Pipes and cables entering through foundation
- • Crawl spaces: Dirt floors allow continuous radon entry
Radon Testing in Philadelphia: What You Need to Know
The EPA and Surgeon General recommend that all homes be tested for radon, regardless of zone classification. Testing is especially critical in Philadelphia given the high risk level.
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