Is Miller County, AR a radon risk area?

Miller County is mapped as Zone 3 - Low Potential by EPA — meaning the county-wide average indoor level is predicted below 2 pCi/L. Nationally that's the 20th percentile for radon potential — Miller County outranks 20% of every county EPA has rated.

Miller County by the numbers

About 41,958 people live in Miller County, Arkansas, spread over 624.04 square miles. Population density there runs about 67 people per square mile. Rank 392 by population within its EPA zone puts Miller County at the 62nd percentile among zone peers. Miller County falls in EPA Radon Region 6, one of 503 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

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

Next steps for a home in Miller County

Nothing about Miller 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 Arkansas's state radon program

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

Every figure on this page traces to EPA's own Map of Radon Zones and Census data, documented in the methodology guide. The guide to what a radon zone actually means covers why testing matters in every zone, not just Zone 1.