Pennsylvania (PA) - Radon Levels & Risk Assessment
Pennsylvania is classified as EPA Zone 1 (Highest Potential) for radon potential, with an average indoor radon level of 5.8 pCi/L. This exceeds the EPA action level of 4.0 pCi/L, meaning most homes in the state should be tested and many will need mitigation. Approximately 44% of homes in Pennsylvania have radon levels above 4.0 pCi/L.
Radon Data for Pennsylvania
| EPA Zone | Zone 1 (Highest Potential) |
| Average Indoor Level | 5.8 pCi/L |
| Homes Above 4.0 pCi/L | 44% |
| Risk Level | High |
| Testing Requirement | Required at point of sale |
| Average Mitigation Cost | $1,300 |
Radon Risk in Pennsylvania
As an EPA Zone 1 (Highest Potential) state, Pennsylvania has some of the highest radon potential in the country. The underlying geology, rich in uranium-bearing rock and soil, produces elevated levels of radon gas that can accumulate in buildings. The average indoor radon level of 5.8 pCi/L is above the EPA action level of 4.0 pCi/L, making testing and mitigation especially important for homeowners.
Testing and Mitigation in Pennsylvania
Pennsylvania requires radon testing as part of real estate transactions. This means sellers must disclose radon test results and buyers have the opportunity to negotiate mitigation as part of the sale. The average cost of radon mitigation in Pennsylvania is $1,300, which is near the national average. Professional radon testers and mitigators in Pennsylvania can be found through the NRPP (National Radon Proficiency Program) or the NRSB (National Radon Safety Board) directories.
Protecting Your Home in Pennsylvania
The EPA recommends that all homes in Pennsylvania be tested for radon, regardless of the state's overall zone classification. If your home tests at 4.0 pCi/L or above, install a mitigation system. If your home tests between 2.0 and 4.0 pCi/L, the EPA suggests considering mitigation. New construction in Pennsylvania may benefit from radon-resistant building techniques (RRNC), which are inexpensive to include during construction and can be easily activated later if radon levels are found to be elevated.
Use our radon risk assessment tool for a personalized estimate based on your home's characteristics, or browse all states to compare radon data across the country.