Kenai Peninsula Borough, AK's soil, for a septic absorption field

Very limited

68.7% of Kenai Peninsula Borough, AK's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. 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. Kenai Peninsula Borough, AK is 16,017.65 square miles with a population of 61,259.

What Kenai Peninsula Borough's reading doesn't cover

Kenai Peninsula Borough's rating is an average across the whole county, not a promise about any one lot inside it. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Kenai Peninsula Borough will actually do.

What a system would cost here

With 68.7% of Kenai Peninsula Borough rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.

Where this sits nationally

Nationally, Kenai Peninsula Borough, AK is the 2,509-most-constrained of 3,058 rated counties for septic soil. Within Alaska alone it ranks 8 of 10.

Before you act on this

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