Marshall County's SSURGO septic rating

Very limited

USDA puts Marshall County, IN at "Very limited" for septic absorption fields, the dominant reading across 81% of the county's soil. Practically, that rules out a simple gravity system for most of the county - 81% of it sits in USDA's most-constrained bucket. The county spans 443.618 square miles, home to 46,464 people.

What this number does and doesn't tell you

Marshall County's rating is an average across the whole county, not a promise about any one lot inside it. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Marshall County: conventional vs. engineered cost

81% of Marshall 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 Marshall County, IN compares

Among the 3,058 rated counties on this site, Marshall County, IN ranks 1,990 most-constrained nationally, and 79 of 90 within Indiana.

Further reading

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