What EPA's radon map says about Clearfield County

Clearfield 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 Clearfield County in the 93rd percentile nationally for radon potential — higher than 93% of the counties EPA has rated.

How Clearfield County compares

About 78,132 people live in Clearfield County, Pennsylvania, spread over 1,145.06 square miles. Averaged across its land area, Clearfield County runs about 68 people per square mile. Among counties sharing Clearfield County's EPA zone, it outranks 78% of them by population. Geologically, Clearfield County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

What this actually means for a house in Clearfield County

Clearfield 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. EPA's guidance doesn't change because of a Zone 1 label: test the house. What changes is the reason to not put it off in Clearfield County specifically.

Next steps for a home in Clearfield County

Mitigation cost doesn't depend on Clearfield 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

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

More on how this number was built

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