Teton County's SSURGO septic rating

Very limited

USDA puts Teton County, ID at "Very limited" for septic absorption fields, the dominant reading across 87.3% of the county's soil. A standard gravity system routinely fails on ground like this; the same share of the county falls in USDA's worst absorption-field bucket outright. For scale: 449.091 square miles and 12,932 people call Teton County home.

Before you rely on this for one lot

This is a countywide, area-weighted figure across every soil survey map unit in Teton County, ID - never a reading for one specific parcel. 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 Teton County, ID

Teton 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.

Teton County's rank among Idaho counties

Among the 3,058 rated counties on this site, Teton County, ID ranks 1,524 most-constrained nationally, and 24 of 44 within Idaho.

Further reading

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