Watonwan County, MN's soil, for a septic absorption field

Very limited

Soil across 94.4% of Watonwan County, MN rates "Very limited" in USDA's septic-absorption-field interpretation. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 94.4% of the county. Watonwan County, MN is 434.947 square miles with a population of 11,204.

What Watonwan County's reading doesn't cover

Two lots a mile apart in Watonwan County can carry different soil, even though they share one countywide rating. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Watonwan County will actually do.

What a system would cost here

With 94.4% of Watonwan 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.

Watonwan County's rank among Minnesota counties

Nationally, Watonwan County, MN is the 733-most-constrained of 3,058 rated counties for septic soil. Within Minnesota alone it ranks 29 of 86.

Before you act on this

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