Fountain County, IN: the USDA septic-suitability picture
Very limited
Fountain County, IN: USDA's soil survey calls 91.8% of the county "Very limited" for a septic leach field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 91.8% of the county. For scale: 395.661 square miles and 16,833 people call Fountain County home.
Before you rely on this for one lot
Two lots a mile apart in Fountain County can carry different soil, even though they share one countywide rating. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).
Budgeting for a system in Fountain County, IN
Fountain County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
Where this sits nationally
Among the 3,058 rated counties on this site, Fountain County, IN ranks 1,068 most-constrained nationally, and 55 of 90 within Indiana.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems