Is Sampson County, NC a radon risk area?

EPA's own radon map rates Sampson County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Sampson County in the 23rd percentile nationally for radon potential — higher than 23% of the counties EPA has rated.

Sampson County by the numbers

About 60,404 people live in Sampson County, North Carolina, spread over 945.932 square miles. Population density there runs about 64 people per square mile. Rank 301 by population within its EPA zone puts Sampson County at the 71st percentile among zone peers. Geologically, Sampson 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 Sampson County

Sampson County's Zone 3 prediction undercuts the roughly 1.3 pCi/L most US homes average, nowhere near EPA's 4 pCi/L threshold for recommending mitigation. A Zone 3 label describes Sampson County's average, not any one basement or slab in it — testing is still the only way an individual homeowner actually finds out.

If Sampson County tests above the action level

Nothing about Sampson County's EPA zone changes the mitigation number: $800–$2,500 nationally (around $1,200 typical), set by the house's foundation rather than the county it sits in — and only relevant once a test actually clears 4 pCi/L.

Find North Carolina's state radon program

Sampson County's test kit answers today; a Airthings radon monitor keeps answering for Sampson County over time. Affiliate link, RadonZoneCheck earns a commission there, at no extra cost to you. Code RADONZONE-10OFF takes 10% off at checkout.

More on how this number was built

Sampson County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.