Dodge County, WI: the USDA septic-suitability picture
Very limited
Dodge County, WI's SSURGO dominant class comes back "Very limited", covering 82.2% of the county. That reading means a conventional system is a poor bet here - 82.2% of Dodge County lands in the strictest "very limited" bucket USDA uses. The county spans 875.699 square miles, home to 88,635 people.
What this number does and doesn't tell you
Dodge County's rating is an average across the whole county, not a promise about any one lot inside it. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Dodge County: conventional vs. engineered cost
82.2% of Dodge 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.
Dodge County's rank among Wisconsin counties
Among the 3,058 rated counties on this site, Dodge County, WI ranks 1,914 most-constrained nationally, and 64 of 72 within Wisconsin.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems