New Data Shows Radon Levels in PA Homes Remain a Concern for Homeowners

The latest statewide testing data reveals that radon levels in PA homes continue to exceed federal safety guidelines in a significant number of residences, prompting renewed attention from public health officials and real estate professionals. The findings, compiled from thousands of residential tests conducted over the past year, indicate that roughly one in every three homes tested showed radon concentrations above the Environmental Protection Agency's recommended action threshold of 4 picocuries per liter of air.

Radon is a naturally occurring radioactive gas that forms from the decay of uranium in soil and rock. It seeps into buildings through cracks in foundations, gaps around pipes, and other openings. Because the gas is colorless, odorless, and tasteless, it can accumulate indoors without any immediate signs. Long-term exposure to elevated radon levels is the second leading cause of lung cancer after smoking, according to the EPA and the Surgeon General's office. The new data on radon levels in PA homes underscores why routine testing remains essential for property owners across the state.

Geographic Patterns and Testing Trends

Pennsylvania sits atop a geological formation known as the Reading Prong, a section of the larger Piedmont region that extends through parts of Berks, Montgomery, Chester, and Delaware counties. This area is rich in uranium-bearing granite, which makes it one of the highest-radon-producing regions in the United States. However, the new testing data shows that elevated readings are not confined to the southeastern corner of the state. Counties in the central and western parts of Pennsylvania also reported homes with radon concentrations above the EPA action level.

Short-term test kits remain the most common method for initial screening, but the data suggests that many homeowners still fail to follow up with long-term testing, which provides a more accurate annual average. The Pennsylvania Department of Environmental Protection encourages all residents to test their homes at least once, and to retest after any major renovations or changes to heating and cooling systems. The agency also recommends testing on every livable level of a home, including basements, because radon can accumulate differently from floor to floor.

Health Implications and Public Awareness

The link between radon exposure and lung cancer is well documented. The EPA estimates that radon causes approximately 21,000 lung cancer deaths in the United States each year, making it a serious and preventable health risk. Smokers are at particularly high risk because the combined effects of tobacco smoke and radon are multiplicative. For nonsmokers, radon is still the primary cause of lung cancer overall.

Despite widespread awareness campaigns, the new data indicates that only about 30 percent of Pennsylvania homeowners have ever tested their properties. That leaves a large portion of the housing stock unchecked. Real estate transactions in the state increasingly include radon testing as a contingency, but voluntary testing rates among current homeowners lag behind. The findings on radon levels in PA homes suggest that more aggressive public education efforts may be needed, especially in rural and suburban areas where testing infrastructure is less developed.

Mitigation Strategies and Costs

When elevated radon concentrations are discovered, mitigation is typically straightforward and cost-effective. The most common approach is a sub-slab depressurization system, which uses a fan and vent pipe to draw radon from beneath the foundation and exhaust it outside. Sealing cracks and openings in the foundation is also part of a standard mitigation plan.

Costs for professional mitigation in Pennsylvania generally range from $800 to $2,500, depending on the size of the home and the complexity of the installation. Many county health departments and local radon information centers offer lists of certified mitigation contractors. Do-it-yourself measures, such as sealing visible cracks and improving ventilation, can reduce radon entry but are rarely sufficient on their own to bring high levels down to safe thresholds.

Legislative and Regulatory Context

Pennsylvania does not have a statewide law requiring radon testing or disclosure during real estate transactions, although many individual municipalities and counties have adopted their own ordinances. The state does mandate that all public schools test for radon every five years, and results must be made available to parents and staff. Some lawmakers have proposed expanding testing requirements to rental properties and day care centers, but no such measures have passed as of the latest legislative session.

The absence of a uniform disclosure requirement means that many buyers and tenants are unaware of a property's radon history. Real estate agents in high-radon areas increasingly recommend that clients include a testing clause in purchase agreements. Lenders do not typically require radon testing as a condition of financing, but some mortgage insurers have started to ask for it in regions with known elevated levels.

Testing Resources and Next Steps

Residents can obtain low-cost radon test kits from the Pennsylvania Department of Environmental Protection, local health departments, and many hardware stores. The kits are simple to use: homeowners place them in the lowest livable area of their home for the recommended period, then mail them to a laboratory for analysis. Results arrive within a few weeks. The EPA recommends that homes with levels at or above 4 picocuries per liter be mitigated, and that homes with levels between 2 and 4 picocuries per liter be considered for mitigation.

The new data on radon levels in PA homes serves as a reminder that the risk is not static. Seasonal changes, home renovations, and even shifts in groundwater can affect how much radon enters a building. Retesting every two years is a prudent step for all homeowners, regardless of previous test results. For those who have never tested, the first step is the simplest: order a kit, follow the instructions, and send it back.

As public health officials continue to analyze the latest figures, the message to Pennsylvania homeowners remains consistent: test your home, mitigate if necessary, and test again later. The data shows that radon is a statewide issue, not just a regional one, and that no home should be assumed safe without evidence.