Dunn County, ND: the USDA septic-suitability picture

Very limited

USDA puts Dunn County, ND at "Very limited" for septic absorption fields, the dominant reading across 81.2% of the county's soil. That reading means a conventional system is a poor bet here - 81.2% of Dunn County lands in the strictest "very limited" bucket USDA uses. The county spans 2,008.492 square miles, home to 4,031 people.

What this number does and doesn't tell you

Dunn 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.

Dunn County: conventional vs. engineered cost

81.2% of Dunn 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.

How Dunn County, ND compares

Among the 3,058 rated counties on this site, Dunn County, ND ranks 1,984 most-constrained nationally, and 16 of 53 within North Dakota.

Further reading

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