What EPA's radon map says about Clinton County

EPA places Clinton County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Clinton County ranks higher in radon potential than 87% of rated counties (the 87th percentile).

Clinton County by the numbers

About 37,865 people live in Clinton County, Pennsylvania, spread over 889.63 square miles. That works out to roughly 43 people per square mile. Among counties sharing Clinton County's EPA zone, it outranks 63% of them by population. EPA's geology-based Region 3 groups Clinton County with 244 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Clinton County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. Being in Zone 1 raises the odds Clinton County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Next steps for a home in Clinton County

Mitigation cost doesn't depend on Clinton 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

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

More on how this number was built

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. Whatever zone Clinton County carries, the zone explainer covers what it does and doesn't tell you about any one house.