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

Very limited

85.3% of Idaho 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. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 85.3% of the county. Idaho County, ID is 8,477.499 square miles with a population of 17,912.

What Idaho County's reading doesn't cover

Nothing about Idaho County, ID's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Idaho County will actually do.

What a system would cost here

With 85.3% of Idaho County rating "Very limited", a standard gravity system is not a safe assumption here. 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 Idaho County, ID compares

Nationally, Idaho County, ID is the 1,666-most-constrained of 3,058 rated counties for septic soil. Within Idaho alone it ranks 29 of 44.

Before you act on this

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