Septic suitability in Benton County, IN
Very limited
Benton County, IN's SSURGO dominant class comes back "Very limited", covering 99.9% of the county. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. The county spans 406.415 square miles, home to 8,853 people.
What this number does and doesn't tell you
Two lots a mile apart in Benton County can carry different soil, even though they share one countywide rating. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Benton County: conventional vs. engineered cost
99.9% of Benton 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, Benton County, IN ranks 4 most-constrained nationally, and 1 of 90 within Indiana.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems