Septic suitability in Grant County, SD

Very limited

USDA puts Grant County, SD at "Very limited" for septic absorption fields, the dominant reading across 92.7% of the county's soil. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 92.7% of Grant County's land. For scale: 681.446 square miles and 7,618 people call Grant County home.

Before you rely on this for one lot

USDA's survey covers the whole of Grant 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 Grant County, SD

Grant 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.

How Grant County, SD compares

Among the 3,058 rated counties on this site, Grant County, SD ranks 969 most-constrained nationally, and 15 of 66 within South Dakota.

Further reading

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