New Data Shows Elevated Radon Levels in PA Homes, Health Officials Urge Testing

Elevated radon levels in PA homes have emerged as a pressing public health concern, according to new data released by state environmental agencies. The findings underscore a long-standing issue that places Pennsylvania among the highest-risk states for radon exposure, a leading cause of lung cancer after smoking.

Radon is a colorless, odorless radioactive gas that forms naturally from the decay of uranium in soil and rock. It seeps into buildings through cracks in foundations, gaps around pipes, and other openings. Once trapped indoors, radon can accumulate to dangerous concentrations. The U.S. Environmental Protection Agency has identified Pennsylvania as having a particularly high potential for elevated indoor radon levels, with many counties designated as Zone 1, the highest risk category.

The latest survey, conducted across more than 10,000 residences over the past year, found that roughly 40 percent of tested homes had radon levels in PA homes that exceeded the EPA's recommended action threshold of 4 picocuries per liter of air. That figure is consistent with historical patterns but has drawn renewed attention because of increased testing following the pandemic, when more people began working from home and became aware of indoor air quality issues.

Why Pennsylvania Is Especially Vulnerable

Pennsylvania's geology makes it a hotspot for radon. The state sits atop a mix of sedimentary, metamorphic, and igneous rock formations, including the Reading Prong, a geological region stretching from Berks County through Lehigh and Northampton counties, which is particularly rich in uranium-bearing granite. Homes built on or near these formations are at higher risk.

Additionally, the state's older housing stock contributes to the problem. Many homes were constructed before radon-resistant building techniques became common. Basements, crawl spaces, and slab-on-grade foundations can all serve as entry points. The combination of geology and aging infrastructure means that radon levels in PA homes can vary widely even within a single neighborhood, making individual testing essential.

Health Implications and Mitigation

Radon exposure is the second leading cause of lung cancer in the United States, responsible for an estimated 21,000 deaths annually, according to the EPA. The risk is dose-dependent: higher concentrations and longer exposure times increase the likelihood of developing lung cancer. Smokers face a compounded risk, as radon and tobacco smoke together dramatically elevate lung cancer odds.

Health officials stress that radon problems are fixable. Mitigation typically involves installing a vent pipe system and fan to pull radon from beneath the house and release it outdoors, a process called sub-slab depressurization. Sealing cracks and openings can also help. The cost of mitigation ranges from $800 to $2,500, depending on the home's design and the severity of the problem. Many homeowners find that the investment pays for itself in peace of mind and reduced health risk.

Testing Is the First Step

Radon cannot be detected without testing. Short-term test kits, which remain in the home for two to seven days, are available at hardware stores, online retailers, and through local health departments. Long-term tests, which measure averages over three months to a year, provide a more accurate picture of year-round exposure. The EPA and the Pennsylvania Department of Environmental Protection recommend testing all homes below the third floor, regardless of geological risk.

Recent legislative efforts have aimed to make testing more accessible. Several municipalities now require radon testing during real estate transactions, and some offer free or subsidized test kits to low-income households. Despite these initiatives, testing rates remain low. A 2023 survey by the American Lung Association found that only about one in five Pennsylvania homeowners had ever tested their homes for radon.

What the Data Means for Homeowners

The new data provides a clear message: radon levels in PA homes are not declining on their own. Without active mitigation, many residences will continue to expose occupants to unnecessary risk. The findings have prompted local health departments to ramp up outreach efforts, including informational campaigns and partnerships with community organizations to distribute test kits.

Real estate professionals are also taking note. Some listing agreements now include radon test results as a disclosure item, and buyers are increasingly requesting tests before closing. While not yet state law, the practice is becoming common in high-risk counties. Sellers who have already mitigated their homes can use test results as a selling point, while those who have not may face pushback from informed buyers.

Policy Responses and Future Directions

At the state level, lawmakers have introduced bills that would require radon testing in schools and child care facilities, as well as in all new residential construction. Proponents argue that the relatively low cost of testing and mitigation is far outweighed by the potential healthcare savings. Opponents cite concerns about regulatory burden and the difficulty of enforcing testing requirements in existing homes.

Meanwhile, the federal EPA continues to update its radon risk maps and provide technical guidance to states. Pennsylvania's own radon program, housed within the Department of Environmental Protection, offers free test kits to residents of certain counties and maintains a searchable database of mitigation contractors. The agency also provides educational materials in multiple languages to reach diverse communities.

Practical Steps for Residents

For anyone living in Pennsylvania, the recommended course of action is straightforward. First, purchase a short-term radon test kit and follow the instructions carefully. If the result is 4 pCi/L or higher, conduct a follow-up test to confirm. If the second test also exceeds the threshold, hire a certified radon mitigation contractor to design and install a system. Retest after mitigation to ensure the system is working.

Homeowners should also consider long-term testing even if initial short-term results are below the action level, as radon concentrations can fluctuate seasonally. Winter months, when homes are sealed tight, often produce the highest readings. Testing during that period can provide a worst-case snapshot.

The data released this year serves as a reminder that radon remains a silent but manageable threat. With proper testing and mitigation, residents can significantly reduce their exposure and protect their families. The key is to act before the problem becomes chronic.

As awareness grows and testing becomes more routine, the hope is that Pennsylvania's legacy as a high-radon state will fade into a history of successful public health intervention. But that outcome depends on individual action today. For now, the message from health officials is clear: test your home, know your numbers, and take steps to reduce radon levels in PA homes if needed.