Granville County, NC radon potential

Granville County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally, Granville County ranks higher in radon potential than 23% of rated counties (the 23rd percentile).

Where Granville County sits nationally

Granville County, North Carolina is home to about 61,544 people across 531.991 square miles. Population density there runs about 116 people per square mile. Within its own EPA zone, Granville County is bigger by population than 71% of the counties that share it. EPA's geology-based Region 4 groups Granville County with 735 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Granville County

Granville 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 label describes Granville County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

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

Where Granville 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 Granville County carries, the zone explainer covers what it does and doesn't tell you about any one house.