Septic suitability in Orange County, IN
Very limited
USDA puts Orange County, IN at "Very limited" for septic absorption fields, the dominant reading across 81.9% of the county's soil. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 81.9% of the county. The county spans 398.379 square miles, home to 19,824 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Orange County, IN at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Orange County: conventional vs. engineered cost
81.9% of Orange County carrying a "Very limited" reading changes the realistic budget here. 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, Orange County, IN ranks 1,933 most-constrained nationally, and 78 of 90 within Indiana.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems