What EPA's radon map says about Carroll County

Carroll County is mapped as Zone 2 - Moderate Potential by EPA — meaning the county-wide average indoor level is predicted between 2 and 4 pCi/L. Rank it against the rest of the country and Carroll County lands in the 50th percentile for radon potential.

Where Carroll County sits nationally

About 28,968 people live in Carroll County, Arkansas, spread over 629.928 square miles. Population density there runs about 46 people per square mile. Among counties sharing Carroll County's EPA zone, it outranks 52% of them by population. Geologically, Carroll County is grouped into EPA Region 6 alongside 502 other counties that share its rock and soil setting.

Zone vs. an actual test

Carroll County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. A Zone 2 rating is a moderate county-wide average, not a guarantee about any one house in Carroll County — testing is the only way to know an individual home's actual level.

Next steps for a home in Carroll County

Mitigation cost doesn't depend on Carroll County's zone — it depends on the house's foundation. A typical system runs $800–$2,500 (about $1,200 typical), and testing first is what tells you whether that's needed at all.

Find Arkansas's state radon program

Carroll County's test kit answers today; a Airthings radon monitor keeps answering for Carroll 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

Carroll County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.