Brunswick County, VA: EPA's radon zone, explained

EPA places Brunswick County in Zone 1 - Highest Potential — a predicted county-wide average indoor radon level above 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Nationally, Brunswick County ranks higher in radon potential than 79% of rated counties (the 79th percentile).

Where Brunswick County sits nationally

Brunswick County, Virginia is home to about 15,750 people across 566.351 square miles. That works out to roughly 28 people per square mile. By population, Brunswick County is the 646th largest of every county sharing its EPA zone — the 39th percentile by population within that zone. Geologically, Brunswick County is grouped into EPA Region 3 alongside 244 other counties that share its rock and soil setting.

What this actually means for a house in Brunswick County

Where the national indoor average runs about 1.3 pCi/L, Brunswick County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Brunswick County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

Next steps for a home in Brunswick County

For a Brunswick 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 Virginia'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. RADONZONE-10OFF at checkout knocks 10% off.

Where Brunswick County's figures come from

The methodology guide shows exactly which EPA and Census sources feed Brunswick County's numbers. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.