Dawson County's SSURGO septic rating

Very limited

Dawson County, MT's SSURGO dominant class comes back "Very limited", covering 79.3% of the county. Practically, that rules out a simple gravity system for most of the county - 79.3% of it sits in USDA's most-constrained bucket. The county spans 2,371.926 square miles, home to 8,731 people.

What this number does and doesn't tell you

USDA's survey covers the whole of Dawson County, MT at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Dawson County: conventional vs. engineered cost

79.3% of Dawson 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.

Dawson County's rank among Montana counties

Among the 3,058 rated counties on this site, Dawson County, MT ranks 2,074 most-constrained nationally, and 31 of 54 within Montana.

Before you act on this

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