What Is a Radon Test and Do I Need One in Pennsylvania?

Radon is a colorless, odorless, radioactive gas that forms naturally as uranium in the soil breaks down, and it can seep into homes through cracks in the foundation and around pipes. Long-term exposure to elevated radon is a leading cause of lung cancer, and it is completely undetectable without testing.

Radon risk varies widely by location and by home, and Pennsylvania is an area where elevated levels are common. Two neighboring houses can test very differently, which is why testing your specific home matters far more than regional averages.

Radon testing is simple and inexpensive, and there are two main approaches. A short-term test sits in the lowest lived-in level of the home for a few days and gives a snapshot reading. A long-term test runs for months and gives a more accurate picture of average exposure.

You can buy do-it-yourself test kits at hardware stores or online, or hire a professional radon tester. In a real estate transaction, a radon test is often done as part of the home inspection, and a result above the action level triggers a conversation about mitigation.

Radon levels are measured in picocuries per liter, and the federal action level is a common reference point for when to fix the problem. A result at or above that level means you should take steps to reduce the radon in your home. Below it, no action is required, though lower is still better.

An elevated result is not a reason to panic; it is a reason to mitigate. Radon reduction systems are proven, and they bring levels down reliably. In a purchase, an elevated test can also become a point of negotiation with the seller.

If your home tests high, a radon mitigation system can usually lower the level to an acceptable range. The most common approach is a vent pipe system and fan that pulls radon from beneath the house and discharges it above the roofline. A certified radon mitigator installs it, typically in a day or two.

Even if your first test is low, radon levels can change with seasons, renovations, and shifts in the ground. Retesting every few years is a reasonable habit, and retesting after any major foundation work is wise.