Septic suitability in Douglas County, WI
Very limited
Douglas County, WI: USDA's soil survey calls 93% of the county "Very limited" for a septic leach field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 93% of Douglas County's land. The county spans 1,304.272 square miles, home to 44,276 people.
What this number does and doesn't tell you
Nothing about Douglas County, WI's SSURGO figure applies to a specific address - it's a county-wide average. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Douglas County: conventional vs. engineered cost
93% of Douglas County carrying a "Very limited" reading changes the realistic budget here. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
Where this sits nationally
Among the 3,058 rated counties on this site, Douglas County, WI ranks 926 most-constrained nationally, and 26 of 72 within Wisconsin.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems