What EPA's radon map says about Clarke County

Clarke 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. Clarke County sits at the 61st percentile nationally for radon potential — above 61 of every 100 rated counties.

Clarke County by the numbers

About 129,995 people live in Clarke County, Georgia, spread over 119.3 square miles. Population density there runs about 1,090 people per square mile. Among counties sharing Clarke County's EPA zone, it outranks 85% of them by population. EPA's geology-based Region 4 groups Clarke County with 735 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Clarke County's Zone 2 prediction. Clarke County's Zone 2 rating sits in the middle nationally; EPA's guidance is unchanged by that — test every home regardless of its zone.

If Clarke County tests above the action level

Mitigation cost doesn't depend on Clarke 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 Georgia's state radon program

Clarke County's test kit answers today; a Airthings radon monitor keeps answering for Clarke 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 Clarke County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.