Knox County's SSURGO septic rating

Very limited

Knox County, IN: USDA's soil survey calls 70.9% of the county "Very limited" for a septic leach field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 70.9% of Knox County's land. The county spans 515.831 square miles, home to 35,872 people.

What this number does and doesn't tell you

USDA's survey covers the whole of Knox 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.

Knox County: conventional vs. engineered cost

70.9% of Knox 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.

How Knox County, IN compares

Among the 3,058 rated counties on this site, Knox County, IN ranks 2,435 most-constrained nationally, and 88 of 90 within Indiana.

Before you act on this

How this rating is built, and its real limits · Conventional vs. engineered septic systems