Brunswick County, NC radon potential

Brunswick County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Rank it against the rest of the country and Brunswick County lands in the 28th percentile for radon potential.

How Brunswick County compares

Brunswick County, North Carolina is home to about 167,112 people across 849.49 square miles. Population density there runs about 197 people per square mile. Within its own EPA zone, Brunswick County is bigger by population than 85% of the counties that share it. EPA's geology-based Region 4 groups Brunswick County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Brunswick County

A Zone 3 county like Brunswick County is predicted closer to the 0.4 pCi/L typical outdoors than to EPA's 4 pCi/L action level. Low doesn't mean zero: EPA's own data shows homes in Zone 3 counties like Brunswick County testing above the action level often enough that skipping a test isn't the safe assumption.

If Brunswick County tests above the action level

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 Brunswick County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Brunswick 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 Brunswick County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Brunswick County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.