Septic soil in Roberts County, SD, by the numbers

Very limited

In Roberts County, SD, 81.9% of the surveyed land carries a "Very limited" rating for a standard septic drain field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 81.9% of Roberts County's land. Roberts County covers 1,101.055 square miles and counts 10,283 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Roberts County, SD at once, not any single address. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Roberts County.

System cost, conventional vs. engineered

Given Roberts County's rating, plan for the engineered-system range rather than the conventional one. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.

Roberts County's rank among South Dakota counties

Nationally, Roberts County, SD is the 1,934-most-constrained of 3,058 rated counties for septic soil. Within South Dakota alone it ranks 48 of 66.

Related guides

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