Randolph County, NC radon potential

Randolph County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Randolph County ranks higher in radon potential than 27% of rated counties (the 27th percentile).

Where Randolph County sits nationally

Randolph County, North Carolina is home to about 148,389 people across 782.336 square miles. That works out to roughly 190 people per square mile. Within its own EPA zone, Randolph County is bigger by population than 83% of the counties that share it. Randolph County falls in EPA Radon Region 4, one of 736 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Randolph County

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Randolph County's Zone 3 prediction is the low end of the scale. Don't read Zone 3 as a pass for Randolph County — EPA's guidance to test every home makes no exception for counties predicted low.

Next steps for a home in Randolph County

A short-term test kit is the standard first step and typically costs far less than mitigation itself. If a test comes back at or above 4 pCi/L, a radon mitigation system for a typical home runs roughly $800–$2,500 (around $1,200 for a common single-family install), driven mainly by foundation type, not by county.

Find North Carolina's state radon program

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

Where Randolph County's figures come from

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