Winona County, MN: the USDA septic-suitability picture

Very limited

Winona County, MN's SSURGO dominant class comes back "Very limited", covering 88% of the county. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 88% of the county. The county spans 626.191 square miles, home to 49,973 people.

What this number does and doesn't tell you

USDA's survey covers the whole of Winona 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.

Winona County: conventional vs. engineered cost

88% of Winona 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, Winona County, MN ranks 1,465 most-constrained nationally, and 58 of 86 within Minnesota.

Further reading

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