Is Garland County, AR a radon risk area?

EPA places Garland County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. That puts Garland County in the 60th percentile nationally for radon potential — higher than 60% of the counties EPA has rated.

Garland County by the numbers

About 99,902 people live in Garland County, Arkansas, spread over 677.615 square miles. Population density there runs about 147 people per square mile. Rank 202 by population within its EPA zone puts Garland County at the 81st percentile among zone peers. Garland 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

Garland County's predicted average falls between EPA's 4 pCi/L action level and the national indoor average of about 1.3 pCi/L (outdoor air runs roughly 0.4 pCi/L). Nothing about a Zone 2 label lowers the case for testing in Garland County — EPA recommends it in every zone, moderate included.

If Garland County tests above the action level

Nothing about Garland 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

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

More on how this number was built

The methodology guide shows exactly which EPA and Census sources feed Garland County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.