What Owen County, IN's soil rates for a septic system
Very limited
Soil across 86.5% of Owen County, IN rates "Very limited" in USDA's septic-absorption-field interpretation. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 86.5% of the county. Owen County, IN is 385.295 square miles with a population of 21,851.
What Owen County's reading doesn't cover
Two lots a mile apart in Owen County can carry different soil, even though they share one countywide rating. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Owen County will actually do.
What a system would cost here
With 86.5% of Owen County rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.
Owen County's rank among Indiana counties
Nationally, Owen County, IN is the 1,579-most-constrained of 3,058 rated counties for septic soil. Within Indiana alone it ranks 68 of 90.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems