Walworth County, WI's soil, for a septic absorption field

Very limited

In Walworth County, WI, 81.6% of the surveyed land carries a "Very limited" rating for a standard septic drain 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. Walworth County covers 555.436 square miles and counts 106,029 residents.

This is a county figure, not a parcel figure

This is a countywide, area-weighted figure across every soil survey map unit in Walworth County, WI - never a reading for one specific parcel. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Walworth County.

System cost, conventional vs. engineered

Given Walworth County's rating, plan for the engineered-system range rather than the conventional one. 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.

Walworth County's rank among Wisconsin counties

Nationally, Walworth County, WI is the 1,958-most-constrained of 3,058 rated counties for septic soil. Within Wisconsin alone it ranks 66 of 72.

Before you act on this

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