Marshall County's SSURGO septic rating

Very limited

Marshall County, MN: USDA's soil survey calls 97.8% of the county "Very limited" for a septic leach field. 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 1,775.06 square miles, home to 8,771 people.

What this number does and doesn't tell you

USDA's survey covers the whole of Marshall County, MN 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.

Marshall County: conventional vs. engineered cost

97.8% 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, MN compares

Among the 3,058 rated counties on this site, Marshall County, MN ranks 283 most-constrained nationally, and 10 of 86 within Minnesota.

Further reading

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