Bonner County, ID: the USDA septic-suitability picture

Very limited

USDA puts Bonner County, ID at "Very limited" for septic absorption fields, the dominant reading across 82.6% of the county's soil. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 82.6% of the county. The county spans 1,733.229 square miles, home to 53,955 people.

What this number does and doesn't tell you

Nothing about Bonner County, ID's SSURGO figure applies to a specific address - it's a county-wide average. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Bonner County: conventional vs. engineered cost

82.6% of Bonner County carrying a "Very limited" reading changes the realistic budget here. 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.

Bonner County's rank among Idaho counties

Among the 3,058 rated counties on this site, Bonner County, ID ranks 1,884 most-constrained nationally, and 31 of 44 within Idaho.

Related guides

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