What Wrangell City and Borough, AK's soil rates for a septic system
Very limited
85.3% of Wrangell City and 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. Wrangell City and Borough, AK is 2,556.105 square miles with a population of 2,064.
What Wrangell City and Borough's reading doesn't cover
Nothing about Wrangell City and Borough, AK's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Wrangell City and Borough will actually do.
What a system would cost here
With 85.3% of Wrangell City and 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, Wrangell City and Borough, AK is the 1,668-most-constrained of 3,058 rated counties for septic soil. Within Alaska alone it ranks 4 of 10.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems