What EPA's radon map says about Hempstead County

EPA's own radon map rates Hempstead County zone 3 - low potential, predicting a county-wide average indoor level below 2 pCi/L. That puts Hempstead County in the 12th percentile nationally for radon potential — higher than 12% of the counties EPA has rated.

How Hempstead County compares

About 19,105 people live in Hempstead County, Arkansas, spread over 727.2 square miles. Averaged across its land area, Hempstead County runs about 26 people per square mile. Among counties sharing Hempstead County's EPA zone, it outranks 38% of them by population. EPA's geology-based Region 6 groups Hempstead County with 502 other counties nationally sharing its underlying rock and soil profile.

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, Hempstead County's Zone 3 prediction is the low end of the scale. A Zone 3 rating means Hempstead County's county-wide average is predicted low, but EPA is explicit that a meaningful share of homes in low-potential zones still test above the action level — a low zone is not a reason to skip testing.

If Hempstead County tests above the action level

Mitigation cost doesn't depend on Hempstead 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

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

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.