Denali Borough, AK: the USDA septic-suitability picture

Very limited

Denali Borough, AK: USDA's soil survey calls 99.3% of the county "Very limited" for a septic leach field. That reading means a conventional system is a poor bet here - 99.3% of Denali Borough lands in the strictest "very limited" bucket USDA uses. The county spans 12,639.746 square miles, home to 1,621 people.

What this number does and doesn't tell you

Two lots a mile apart in Denali Borough can carry different soil, even though they share one countywide rating. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Denali Borough: conventional vs. engineered cost

99.3% of Denali Borough 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, Denali Borough, AK ranks 59 most-constrained nationally, and 2 of 10 within Alaska.

Further reading

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