Septic suitability in Walworth County, SD

Somewhat limited

USDA puts Walworth County, SD at "Somewhat limited" for septic absorption fields, the dominant reading across 56.3% of the county's soil. A conventional system can still work here with design changes - a larger field, added fill, or a shallower layout - but it isn't guaranteed. For scale: 707.455 square miles and 5,270 people call Walworth County home.

Before you rely on this for one lot

USDA's survey covers the whole of Walworth County, SD at once, not any single address. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Walworth County, SD

Walworth County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. 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.

Walworth County's rank among South Dakota counties

Among the 3,058 rated counties on this site, Walworth County, SD ranks 2,978 most-constrained nationally, and 66 of 66 within South Dakota.

Related guides

How this rating is built, and its real limits · How a percolation test actually works