What EPA's radon map says about Jackson County

EPA's own radon map rates Jackson County zone 2 - moderate potential, predicting a county-wide average indoor level between 2 and 4 pCi/L. Nationally that's the 34th percentile for radon potential — Jackson County outranks 34% of every county EPA has rated.

Jackson County by the numbers

About 2,737 people live in Jackson County, South Dakota, spread over 1,863.883 square miles. Population density there runs about 1 people per square mile. Among counties sharing Jackson County's EPA zone, it outranks 4% of them by population. EPA's geology-based Region 8 groups Jackson County with 290 other counties nationally sharing its underlying rock and soil profile.

What this actually means for a house in Jackson County

Call it a middle case: above the 1.3 pCi/L most US homes average, below the 4 pCi/L line EPA uses to recommend mitigation — that's Jackson County's Zone 2 prediction. A county-wide moderate average, like Jackson County's, can still hide a specific house well above or below it — testing is what actually answers the question.

Next steps for a home in Jackson County

Mitigation cost doesn't depend on Jackson 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

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