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

Wyoming County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts Wyoming County in the 84th percentile nationally for radon potential — higher than 84% of the counties EPA has rated.

How Wyoming County compares

Wyoming County, Pennsylvania is home to about 25,771 people across 397.258 square miles. That works out to roughly 65 people per square mile. By population, Wyoming County is the 510th largest of every county sharing its EPA zone — the 52nd percentile by population within that zone. EPA's geology-based Region 3 groups Wyoming County with 244 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Wyoming County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Wyoming County will test well under the action level, and EPA's guidance is to test regardless of zone.

If Wyoming County tests above the action level

For a Wyoming 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 Wyoming County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Wyoming 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 Wyoming County's figures come from

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