Septic suitability in Coos County, OR

Very limited

USDA puts Coos County, OR at "Very limited" for septic absorption fields, the dominant reading across 96.6% 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 1,596.051 square miles, home to 64,326 people.

What this number does and doesn't tell you

Coos County's rating is an average across the whole county, not a promise about any one lot inside it. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Coos County: conventional vs. engineered cost

96.6% of Coos 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.

Coos County's rank among Oregon counties

Among the 3,058 rated counties on this site, Coos County, OR ranks 430 most-constrained nationally, and 9 of 36 within Oregon.

Before you act on this

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