Johnson County, IN's soil, for a septic absorption field

Very limited

92.2% of Johnson County, IN's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 92.2% of Johnson County's land. Johnson County, IN is 320.415 square miles with a population of 170,614.

What Johnson County's reading doesn't cover

This is a countywide, area-weighted figure across every soil survey map unit in Johnson County, IN - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Johnson County will actually do.

What a system would cost here

With 92.2% of Johnson County rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.

Johnson County's rank among Indiana counties

Nationally, Johnson County, IN is the 1,008-most-constrained of 3,058 rated counties for septic soil. Within Indiana alone it ranks 52 of 90.

Before you act on this

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