Bonner County, ID Septic Rating
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; that share is already USDA's strictest bucket, not a lesser constraint layered on top. The county spans 1,733 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