Is Clay County, NC a radon risk area?

EPA's own radon map rates Clay County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Clay County sits at the 41st percentile nationally for radon potential — above 41 of every 100 rated counties.

Clay County by the numbers

About 12,042 people live in Clay County, North Carolina, spread over 215.004 square miles. Population density there runs about 56 people per square mile. Rank 784 by population within its EPA zone puts Clay County at the 24th percentile among zone peers. EPA's geology-based Region 4 groups Clay County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Clay County

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 Clay County's Zone 2 prediction. Clay 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 Clay County tests above the action level

Nothing about Clay County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find North Carolina's state radon program

Clay County's test kit answers today; a Airthings radon monitor keeps answering for Clay 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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.