Is Scott County, IN a radon risk area?

EPA's own radon map rates Scott County zone 1 - highest potential, predicting a county-wide average indoor level above 4 pCi/L. Nationally that's the 83rd percentile for radon potential — Scott County outranks 83% of every county EPA has rated.

Scott County by the numbers

About 24,751 people live in Scott County, Indiana, spread over 190.403 square miles. Averaged across its land area, Scott County runs about 130 people per square mile. Rank 521 by population within its EPA zone puts Scott County at the 51st percentile among zone peers. Scott County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Zone vs. an actual test

Scott County carries a Zone 1 label because its predicted average clears 4 pCi/L outright — three-plus times the 0.4 pCi/L typical outdoors and above the 1.3 pCi/L most homes see. 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 Scott County will test well under the action level, and EPA's guidance is to test regardless of zone.

If Scott County tests above the action level

Nothing about Scott 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 Indiana's state radon program

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

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