What Sanborn County, SD's soil rates for a septic system

Very limited

In Sanborn County, SD, 92.8% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 92.8% of the county. Sanborn County covers 569.242 square miles and counts 2,392 residents.

This is a county figure, not a parcel figure

Sanborn County's rating is an average across the whole county, not a promise about any one lot inside it. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Sanborn County.

System cost, conventional vs. engineered

Given Sanborn 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.

How Sanborn County, SD compares

Nationally, Sanborn County, SD is the 958-most-constrained of 3,058 rated counties for septic soil. Within South Dakota alone it ranks 14 of 66.

Before you act on this

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