Potter County's SSURGO septic rating
Very limited
Potter County, SD's SSURGO dominant class comes back "Very limited", covering 73% of the county. Practically, that rules out a simple gravity system for most of the county - 73% of it sits in USDA's most-constrained bucket. The county spans 861.138 square miles, home to 2,402 people.
What this number does and doesn't tell you
Nothing about Potter County, SD'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.
Potter County: conventional vs. engineered cost
73% of Potter 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.
Potter County's rank among South Dakota counties
Among the 3,058 rated counties on this site, Potter County, SD ranks 2,371 most-constrained nationally, and 57 of 66 within South Dakota.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems