Is Jerauld County, SD a radon risk area?

EPA's own radon map rates Jerauld County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally, Jerauld County ranks higher in radon potential than 67% of rated counties (the 67th percentile).

Jerauld County by the numbers

About 1,689 people live in Jerauld County, South Dakota, spread over 526.133 square miles. Population density there runs about 3 people per square mile. Rank 1044 by population within its EPA zone puts Jerauld County at the 2nd percentile among zone peers. Geologically, Jerauld County is grouped into EPA Region 8 alongside 290 other counties that share its rock and soil setting.

What this actually means for a house in Jerauld County

Outdoor air nationally averages about 0.4 pCi/L, indoor air about 1.3 pCi/L — Jerauld County's Zone 1 prediction clears both of those and EPA's fix-it threshold besides. Being in Zone 1 raises the odds Jerauld County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Jerauld County tests above the action level

Nothing about Jerauld 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

Jerauld County's test kit answers today; a Airthings radon monitor keeps answering for Jerauld 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. Whatever zone Jerauld County carries, the zone explainer covers what it does and doesn't tell you about any one house.