Rock County, WI Septic Rating

Rock County's SSURGO septic rating

Very limited

Rock County, WI's SSURGO dominant class comes back "Very limited", covering 87.5% of the county. That reading means a conventional system is a poor bet here - it's already USDA's strictest "very limited" bucket, not a partial constraint. The county spans 718 square miles, home to 165,461 people.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Rock County, WI - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Rock County: conventional vs. engineered cost

87.5% of Rock 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.

How Rock County, WI compares

Among the 3,058 rated counties on this site, Rock County, WI ranks 1,505 most-constrained nationally, and 50 of 72 within Wisconsin.

Further reading

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