Septic suitability in Wibaux County, MT
Very limited
USDA puts Wibaux County, MT at "Very limited" for septic absorption fields, the dominant reading across 75.8% 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. The county spans 889.571 square miles, home to 911 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Wibaux County, MT - 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.
Wibaux County: conventional vs. engineered cost
75.8% of Wibaux 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.
How Wibaux County, MT compares
Among the 3,058 rated counties on this site, Wibaux County, MT ranks 2,246 most-constrained nationally, and 35 of 54 within Montana.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems