Radon Testing: What Every Pennsylvania Homeowner Should Know

Of all the things that can be wrong with a house, radon is the one with the best hiding skills. It's a radioactive gas produced by the natural breakdown of uranium in soil and rock. Outdoors it disperses harmlessly; indoors it can seep through foundation cracks and openings and accumulate. It has no color, no smell, and no immediate symptoms — which is why the only way to know your home's radon level is to test for it.

Why Pennsylvania homeowners should pay attention

Pennsylvania's geology — its soils and bedrock — makes elevated radon common across much of the state, and the state has long encouraged homeowners to test. Two homes on the same street can have completely different levels, because radon depends on the soil under your specific foundation and how your house draws air from the ground. According to the EPA, radon is the second-leading cause of lung cancer in the United States. That combination — common here, invisible, and a genuine health risk — is exactly why radon testing is a routine part of home purchases and responsible homeownership in this state.

When should you test?

• When buying a home. Testing is a standard part of many Pennsylvania real estate transactions — you'll want your own result, not the seller's say-so.
• If you've never tested. No symptoms and no smell tell you nothing. A first test establishes your baseline.
• After finishing a basement. Turning a basement into living space means spending real hours in the lowest, most radon-prone part of the house. Test before the family moves downstairs.
• After major foundation or HVAC work, which can change how your home breathes and draws soil gas.
• Every few years, and after a prior mitigation, to confirm levels stay low.

How testing works

A testing pro places a device or test kit in the lowest lived-in level of the home, under closed-house conditions, for a set period — short-term tests typically run a few days. The sample is then read or sent to a lab, and you get a number measured in picocuries per liter (pCi/L). The EPA recommends taking action to reduce radon at 4 pCi/L or above, and considering action for levels between 2 and 4. A single short-term test is a snapshot; pros can advise whether a follow-up or long-term test makes sense for your situation, especially for real estate deadlines.

If your level is high

A high result is fixable — this is the reassuring part. Radon mitigation systems, typically a vent pipe and fan that pull radon from beneath the home and exhaust it safely outside, can reduce indoor levels significantly. The process is well-established, usually completed quickly, and followed by a retest to confirm the result. What you shouldn't do is ignore a high reading or assume opening windows solved it — ventilation fluctuates; a mitigation system works continuously.

Getting it done

Testing is inexpensive peace of mind relative to what's at stake, and in a transaction it's often the difference between confidence and a closing-table scramble. If you need a testing pro, one request through Gold Star matches you instantly with insured, verified local companies — free for homeowners. Learn more about how matching works on our how it works page, and let the test result — not a guess — tell you what your home needs.

Questions & Answers

Carli James writes for Gold Star Referrals.