Butte County, ID: the USDA septic-suitability picture

Very limited

USDA puts Butte County, ID at "Very limited" for septic absorption fields, the dominant reading across 77% of the county's soil. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 77% of Butte County's land. For scale: 2,236.487 square miles and 2,735 people call Butte County home.

Before you rely on this for one lot

Butte County's rating is an average across the whole county, not a promise about any one lot inside it. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Butte County, ID

Butte County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.

How Butte County, ID compares

Among the 3,058 rated counties on this site, Butte County, ID ranks 2,178 most-constrained nationally, and 35 of 44 within Idaho.

Further reading

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