What Hutchinson County, SD's soil rates for a septic system
Very limited
In Hutchinson County, SD, 90.2% of the surveyed land carries a "Very limited" rating for a standard septic drain field. That reading means a conventional system is a poor bet here - 90.2% of Hutchinson County lands in the strictest "very limited" bucket USDA uses. Hutchinson County covers 813.013 square miles and counts 7,416 residents.
This is a county figure, not a parcel figure
Two lots a mile apart in Hutchinson County can carry different soil, even though they share one countywide rating. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Hutchinson County.
System cost, conventional vs. engineered
Given Hutchinson 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.
Where this sits nationally
Nationally, Hutchinson County, SD is the 1,250-most-constrained of 3,058 rated counties for septic soil. Within South Dakota alone it ranks 23 of 66.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems