Tioga County, PA: EPA's radon zone, explained

EPA's own radon map rates Tioga County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. That puts Tioga County in the 88th percentile nationally for radon potential — higher than 88% of the counties EPA has rated.

Tioga County by the numbers

Tioga County, Pennsylvania is home to about 40,698 people across 1,133.892 square miles. That works out to roughly 36 people per square mile. By population, Tioga County is the 376th largest of every county sharing its EPA zone — the 65th percentile by population within that zone. EPA's geology-based Region 3 groups Tioga County with 244 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Tioga County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. That doesn't mean every Tioga County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Testing and mitigation in Tioga County

For a Tioga County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find Pennsylvania's state radon program

For Tioga County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Tioga County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Tioga County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Tioga County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.