Alamance County, NC radon potential
EPA's own radon map rates Alamance County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Alamance County in the 28th percentile nationally for radon potential — higher than 28% of the counties EPA has rated.
Where Alamance County sits nationally
Alamance County, North Carolina is home to about 183,040 people across 423.465 square miles. That works out to roughly 432 people per square mile. Within its own EPA zone, Alamance County is bigger by population than 87% of the counties that share it. EPA's geology-based Region 4 groups Alamance County with 735 other counties nationally sharing its underlying rock and soil profile.
Zone vs. an actual test
Alamance County's predicted average sits below the national indoor average of about 1.3 pCi/L, well under EPA's 4 pCi/L action level. A Zone 3 rating means Alamance County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.
Next steps for a home in Alamance 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 Alamance County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Alamance 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 Alamance County's figures come from
Alamance County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Alamance County carries, the zone explainer covers what it does and doesn't tell you about any one house.