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

EPA's own radon map rates Juniata County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Juniata County sits at the 83rd percentile nationally for radon potential — above 83 of every 100 rated counties.

Juniata County by the numbers

Juniata County, Pennsylvania is home to about 23,395 people across 391.391 square miles. That works out to roughly 60 people per square mile. By population, Juniata County is the 532nd largest of every county sharing its EPA zone — the 50th percentile by population within that zone. Geologically, Juniata 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

Juniata County's predicted average sits above EPA's own action level of 4 pCi/L — the concentration at which EPA recommends fixing a home — versus a national average around 1.3 pCi/L indoors and 0.4 pCi/L outdoors. Some Juniata County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

If Juniata County tests above the action level

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

Where Juniata County's figures come from

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