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

Nash 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 Nash County lands in the 26th percentile for radon potential.

Nash County by the numbers

Nash County, North Carolina is home to about 97,990 people across 540.444 square miles. That works out to roughly 181 people per square mile. By population, Nash County is the 221st largest of every county sharing its EPA zone — the 79th percentile by population within that zone. Geologically, Nash County is grouped into EPA Region 4 alongside 735 other counties that share its rock and soil setting.

Zone vs. an actual test

Well clear of both the 1.3 pCi/L national indoor average and EPA's 4 pCi/L action level, Nash County's Zone 3 prediction is the low end of the scale. Even at Zone 3, Nash County homes are not guaranteed a low reading — zone is a county-wide average, and EPA recommends testing every home regardless of zone.

If Nash County tests above the action level

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

The methodology guide shows exactly which EPA and Census sources feed Nash County's numbers. Whatever zone Nash County carries, the zone explainer covers what it does and doesn't tell you about any one house.