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

Very limited

89.8% of Lyman County, SD's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 89.8% of Lyman County's land. Lyman County covers 1,642.285 square miles and counts 3,721 residents.

This is a county figure, not a parcel figure

Nothing about Lyman County, SD's SSURGO figure applies to a specific address - it's a county-wide average. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in Lyman County.

System cost, conventional vs. engineered

Given Lyman 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 Lyman County, SD compares

Nationally, Lyman County, SD is the 1,297-most-constrained of 3,058 rated counties for septic soil. Within South Dakota alone it ranks 27 of 66.

Before you act on this

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