Lake County, OR's soil, for a septic absorption field

Very limited

In Lake County, OR, 88.7% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 88.7% of it sits in USDA's most-constrained bucket. Lake County, OR is 8,138.61 square miles with a population of 8,194.

What Lake County's reading doesn't cover

This is a countywide, area-weighted figure across every soil survey map unit in Lake County, OR - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Lake County will actually do.

What a system would cost here

With 88.7% of Lake 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.

Lake County's rank among Oregon counties

Nationally, Lake County, OR is the 1,400-most-constrained of 3,058 rated counties for septic soil. Within Oregon alone it ranks 27 of 36.

Further reading

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