Graham County, NC: EPA's radon zone, explained

Graham 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. Graham County sits at the 38th percentile nationally for radon potential — above 38 of every 100 rated counties.

How Graham County compares

Graham County, North Carolina is home to about 8,179 people across 291.972 square miles. Averaged across its land area, Graham County runs about 28 people per square mile. By population, Graham County is the 865th largest of every county sharing its EPA zone — the 16th percentile by population within that zone. EPA's geology-based Region 4 groups Graham County with 735 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

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 Graham County's Zone 2 prediction. Nothing about a Zone 2 label lowers the case for testing in Graham County — EPA recommends it in every zone, moderate included.

Next steps for a home in Graham County

For a Graham County homeowner, the order is simple: test first, since a kit costs a small fraction of what mitigation would. Only if the result clears 4 pCi/L does a system — typically $800–$2,500, about $1,200 for a common install — become worth pricing out.

Find North Carolina's state radon program

For Graham County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Graham County's levels over time. RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

Where Graham County's figures come from

Graham County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.