Sheridan County, MT: the USDA septic-suitability picture

Very limited

Sheridan County, MT: USDA's soil survey calls 90.5% of the county "Very limited" for a septic leach field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 90.5% of the county. For scale: 1,676.941 square miles and 3,448 people call Sheridan County home.

Before you rely on this for one lot

Nothing about Sheridan County, MT's SSURGO figure applies to a specific address - it's a county-wide average. 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 Sheridan County, MT

Sheridan 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.

How Sheridan County, MT compares

Among the 3,058 rated counties on this site, Sheridan County, MT ranks 1,215 most-constrained nationally, and 4 of 54 within Montana.

Related guides

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