Is LaGrange County, IN a radon risk area?

LaGrange County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. That puts LaGrange County in the 88th percentile nationally for radon potential — higher than 88% of the counties EPA has rated.

How LaGrange County compares

About 41,122 people live in LaGrange County, Indiana, spread over 379.632 square miles. Population density there runs about 108 people per square mile. Rank 371 by population within its EPA zone puts LaGrange County at the 65th percentile among zone peers. LaGrange County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

Why the zone isn't the answer by itself

LaGrange 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. Some LaGrange County homes will test comfortably under the action level despite the county's Zone 1 rating — the only way to know which kind of home you have is an actual test.

Testing and mitigation in LaGrange County

Nothing about LaGrange 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

LaGrange County's test kit answers today; a Airthings radon monitor keeps answering for LaGrange 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 LaGrange County's numbers. If you're unsure why a low zone still deserves a test, the zone explainer covers that directly.