Custer County's SSURGO septic rating

Very limited

Custer County, ID's SSURGO dominant class comes back "Very limited", covering 87.4% of the county. That reading means a conventional system is a poor bet here - 87.4% of Custer County lands in the strictest "very limited" bucket USDA uses. The county spans 4,922.177 square miles, home to 4,597 people.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Custer County, ID - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Custer County: conventional vs. engineered cost

87.4% of Custer 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.

Custer County's rank among Idaho counties

Among the 3,058 rated counties on this site, Custer County, ID ranks 1,520 most-constrained nationally, and 23 of 44 within Idaho.

Further reading

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