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

EPA's own radon map rates Greene County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Greene County sits at the 52nd percentile nationally for radon potential — above 52 of every 100 rated counties.

Where Greene County sits nationally

Greene County, Pennsylvania is home to about 33,960 people across 575.932 square miles. That works out to roughly 59 people per square mile. By population, Greene County is the 451st largest of every county sharing its EPA zone — the 56th percentile by population within that zone. Geologically, Greene County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

Why the zone isn't the answer by itself

Neither at the 4 pCi/L action level nor down at the roughly 1.3 pCi/L national indoor norm, Greene County's Zone 2 prediction lands in the gap between the two. Nothing about a Zone 2 label lowers the case for testing in Greene County — EPA recommends it in every zone, moderate included.

If Greene County tests above the action level

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

Where Greene County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Greene County's numbers. Whatever zone Greene County carries, the zone explainer covers what it does and doesn't tell you about any one house.