What Adams County, WI's soil rates for a septic system

Very limited

Soil across 92.2% of Adams County, WI rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 92.2% of it sits in USDA's most-constrained bucket. Adams County, WI is 645.646 square miles with a population of 21,352.

What Adams County's reading doesn't cover

USDA's survey covers the whole of Adams County, WI at once, not any single address. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Adams County will actually do.

What a system would cost here

With 92.2% of Adams 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.

Where this sits nationally

Nationally, Adams County, WI is the 1,015-most-constrained of 3,058 rated counties for septic soil. Within Wisconsin alone it ranks 31 of 72.

Before you act on this

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