What EPA's radon map says about Cambria County

Cambria County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. That puts Cambria County in the 61st percentile nationally for radon potential — higher than 61% of the counties EPA has rated.

Where Cambria County sits nationally

About 130,108 people live in Cambria County, Pennsylvania, spread over 687.963 square miles. Population density there runs about 189 people per square mile. Among counties sharing Cambria County's EPA zone, it outranks 85% of them by population. Geologically, Cambria 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

Cambria County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Nothing about a Zone 2 label lowers the case for testing in Cambria County — EPA recommends it in every zone, moderate included.

If Cambria County tests above the action level

Mitigation cost doesn't depend on Cambria County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Pennsylvania's state radon program

Cambria County's test kit answers today; a Airthings radon monitor keeps answering for Cambria County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Use code RADONZONE-10OFF at checkout for 10% off.

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Cambria County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.