Is Lawrence County, IN a radon risk area?

Lawrence County is mapped as Zone 1 - Highest Potential by EPA — meaning the county-wide average indoor level is predicted above 4 pCi/L. Nationally that's the 89th percentile for radon potential — Lawrence County outranks 89% of every county EPA has rated.

How Lawrence County compares

About 45,192 people live in Lawrence County, Indiana, spread over 449.146 square miles. Population density there runs about 101 people per square mile. Rank 348 by population within its EPA zone puts Lawrence County at the 67th percentile among zone peers. Lawrence County falls in EPA Radon Region 5, one of 524 counties nationally EPA assigns to that same geologic province.

What this actually means for a house in Lawrence County

Where the national indoor average runs about 1.3 pCi/L, Lawrence County's Zone 1 rating puts its predicted county average above EPA's 4 pCi/L action level itself. Being in Zone 1 raises the odds Lawrence County homes test above the action level, but it does not mean any specific house does — EPA recommends every home be tested, in every zone, because the only way to know is to test.

If Lawrence County tests above the action level

Nothing about Lawrence 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

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

Lawrence County's zone, rank and region all trace back to named EPA and Census sources — the methodology guide lists exactly which ones. Whatever zone Lawrence County carries, the zone explainer covers what it does and doesn't tell you about any one house.