Montour County, PA: EPA's radon zone, explained
EPA's own radon map rates Montour County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Montour County lands in the 81st percentile for radon potential.
Where Montour County sits nationally
Montour County, Pennsylvania is home to about 18,115 people across 130.331 square miles. That works out to roughly 139 people per square mile. By population, Montour County is the 598th largest of every county sharing its EPA zone — the 44th percentile by population within that zone. Geologically, Montour County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.
Zone vs. an actual test
Where the national indoor average runs about 1.3 pCi/L, Montour County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. 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 Montour County will test well under the action level, and EPA's guidance is to test regardless of zone.
Testing and mitigation in Montour County
For a Montour 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 Montour County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Montour County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.
Where Montour County's figures come from
Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Montour County carries, the zone explainer covers what it does and doesn't tell you about any one house.