Is Deuel County, SD a radon risk area?

EPA's own radon map rates Deuel County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Rank it against the rest of the country and Deuel County lands in the 70th percentile for radon potential.

How Deuel County compares

About 4,335 people live in Deuel County, South Dakota, spread over 622.739 square miles. Averaged across its land area, Deuel County runs about 7 people per square mile. Rank 942 by population within its EPA zone puts Deuel County at the 12th percentile among zone peers. EPA's geology-based Region 8 groups Deuel County with 290 other counties nationally sharing its underlying rock and soil profile.

Zone vs. an actual test

Where the national indoor average runs about 1.3 pCi/L, Deuel County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. A Zone 1 rating means testing is worth doing sooner rather than later, but it is still county-wide average, not a reading for any single house — some homes in Deuel County will test well under the action level, and EPA's guidance is to test regardless of zone.

Testing and mitigation in Deuel County

Nothing about Deuel 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 South Dakota's state radon program

Deuel County's test kit answers today; a Airthings radon monitor keeps answering for Deuel 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. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.