What EPA's radon map says about Hutchinson County

Hutchinson County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Hutchinson County sits at the 73rd percentile nationally for radon potential — above 73 of every 100 rated counties.

Where Hutchinson County sits nationally

About 7,416 people live in Hutchinson County, South Dakota, spread over 813.013 square miles. That works out to roughly 9 people per square mile. Among counties sharing Hutchinson County's EPA zone, it outranks 22% of them by population. EPA's geology-based Region 8 groups Hutchinson County with 290 other counties nationally sharing its underlying rock and soil profile.

Why the zone isn't the answer by itself

Fixing a home becomes an EPA recommendation past 4 pCi/L, and that is precisely the side of the line Hutchinson County's Zone 1 prediction lands on, well above the roughly 1.3 pCi/L most US homes average. That doesn't mean every Hutchinson County house tests high — a zone is a county-wide prediction, never a single-home reading — but it's a reason to test sooner rather than let it wait.

Next steps for a home in Hutchinson County

Mitigation cost doesn't depend on Hutchinson 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 South Dakota's state radon program

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