What Shoshone County, ID's soil rates for a septic system

Very limited

99% of Shoshone County, ID'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 99% of Shoshone County's land. Shoshone County covers 2,637.425 square miles and counts 14,074 residents.

This is a county figure, not a parcel figure

USDA's survey covers the whole of Shoshone County, ID 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 Shoshone County.

System cost, conventional vs. engineered

Given Shoshone 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 Shoshone County, ID compares

Nationally, Shoshone County, ID is the 97-most-constrained of 3,058 rated counties for septic soil. Within Idaho alone it ranks 2 of 44.

Before you act on this

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