What Marquette County, WI's soil rates for a septic system
Very limited
In Marquette County, WI, 96.5% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 96.5% of it sits in USDA's most-constrained bucket. Marquette County, WI is 455.706 square miles with a population of 15,743.
What Marquette County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Marquette County, WI - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Marquette County will actually do.
What a system would cost here
With 96.5% of Marquette 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.
How Marquette County, WI compares
Nationally, Marquette County, WI is the 457-most-constrained of 3,058 rated counties for septic soil. Within Wisconsin alone it ranks 8 of 72.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems