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

Very limited

82.5% of Vernon County, WI's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. That reading means a conventional system is a poor bet here - 82.5% of Vernon County lands in the strictest "very limited" bucket USDA uses. Vernon County covers 791.563 square miles and counts 31,351 residents.

This is a county figure, not a parcel figure

Nothing about Vernon County, WI's SSURGO figure applies to a specific address - it's a county-wide average. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Vernon County.

System cost, conventional vs. engineered

Given Vernon 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.

Vernon County's rank among Wisconsin counties

Nationally, Vernon County, WI is the 1,891-most-constrained of 3,058 rated counties for septic soil. Within Wisconsin alone it ranks 62 of 72.

Before you act on this

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