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

EPA places Davidson County in Zone 3 - Low Potential — a predicted county-wide average indoor radon level below 2 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Davidson County in the 28th percentile nationally for radon potential — higher than 28% of the counties EPA has rated.

How Davidson County compares

Davidson County, North Carolina is home to about 177,809 people across 552.989 square miles. Averaged across its land area, Davidson County runs about 322 people per square mile. By population, Davidson County is the 147th largest of every county sharing its EPA zone — the 86th percentile by population within that zone. Geologically, Davidson County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

What this actually means for a house in Davidson County

Davidson 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 Davidson 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.

If Davidson County tests above the action level

For a Davidson 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 Davidson County, an ongoing number beats a one-time test - a Airthings radon monitor tracks Davidson 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 Davidson 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 Davidson County carries, the zone explainer covers what it does and doesn't tell you about any one house.