Sherman County, OR: the USDA septic-suitability picture

Very limited

Sherman County, OR's SSURGO dominant class comes back "Very limited", covering 72.8% of the county. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 72.8% of the county. For scale: 823.614 square miles and 2,002 people call Sherman County home.

Before you rely on this for one lot

Nothing about Sherman County, OR'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 Sherman County, OR

Sherman 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.

Where this sits nationally

Among the 3,058 rated counties on this site, Sherman County, OR ranks 2,380 most-constrained nationally, and 36 of 36 within Oregon.

Related guides

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