Oliver County's SSURGO septic rating
Very limited
Oliver County, ND's SSURGO dominant class comes back "Very limited", covering 77.5% of the county. That reading means a conventional system is a poor bet here - 77.5% of Oliver County lands in the strictest "very limited" bucket USDA uses. The county spans 722.404 square miles, home to 1,882 people.
What this number does and doesn't tell you
Oliver 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.
Oliver County: conventional vs. engineered cost
77.5% of Oliver 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Oliver County, ND ranks 2,162 most-constrained nationally, and 22 of 53 within North Dakota.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems