Septic soil in Klickitat County, WA, by the numbers

Very limited

79.1% of Klickitat County, WA's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 79.1% of Klickitat County's land. Klickitat County, WA is 1,871.636 square miles with a population of 24,124.

What Klickitat County's reading doesn't cover

Klickitat County'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 Klickitat County will actually do.

What a system would cost here

With 79.1% of Klickitat County 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.

Klickitat County's rank among Washington counties

Nationally, Klickitat County, WA is the 2,088-most-constrained of 3,058 rated counties for septic soil. Within Washington alone it ranks 32 of 39.

Before you act on this

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