Septic suitability in Posey County, IN
Very limited
Posey County, IN's SSURGO dominant class comes back "Very limited", covering 69.5% of the county. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 69.5% of the county. The county spans 409.385 square miles, home to 25,067 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Posey 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.
Posey County: conventional vs. engineered cost
69.5% of Posey 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.
Posey County's rank among Indiana counties
Among the 3,058 rated counties on this site, Posey County, IN ranks 2,480 most-constrained nationally, and 89 of 90 within Indiana.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems