Fillmore County, MN: the USDA septic-suitability picture

Very limited

Fillmore County, MN: USDA's soil survey calls 87.2% 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. For scale: 861.333 square miles and 21,502 people call Fillmore County home.

Before you rely on this for one lot

USDA's survey covers the whole of Fillmore County, MN at once, not any single address. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Fillmore County, MN

Fillmore County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. 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.

Fillmore County's rank among Minnesota counties

Among the 3,058 rated counties on this site, Fillmore County, MN ranks 1,529 most-constrained nationally, and 59 of 86 within Minnesota.

Related guides

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