Is Jones County, SD a radon risk area?

EPA places Jones County in Zone 2 - Moderate Potential — a predicted county-wide average indoor radon level between 2 and 4 pCi/L, based on the geology, soil and aerial radioactivity data behind EPA's national map. Rank it against the rest of the country and Jones County lands in the 33rd percentile for radon potential.

Where Jones County sits nationally

About 874 people live in Jones County, South Dakota, spread over 969.668 square miles. Population density there runs about 1 people per square mile. Rank 1021 by population within its EPA zone puts Jones County at the 1st percentile among zone peers. Jones County falls in EPA Radon Region 8, one of 291 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Jones County

Jones County's Zone 2 prediction clears the 1.3 pCi/L national indoor average without reaching EPA's own 4 pCi/L point for recommending a fix. Middle-of-the-pack doesn't mean risk-free for any one Jones County address — a moderate county average still leaves individual homes to test either side of it.

Next steps for a home in Jones County

Nothing about Jones 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

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

The methodology guide shows exactly which EPA and Census sources feed Jones County's numbers. Whatever zone Jones County carries, the zone explainer covers what it does and doesn't tell you about any one house.