Lassen County, CA's soil, for a septic absorption field
Very limited
In Lassen County, CA, 91.6% of the surveyed land carries a "Very limited" rating for a standard septic drain field. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 91.6% of Lassen County's land. Lassen County, CA is 4,541.369 square miles with a population of 28,340.
What Lassen County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Lassen County, CA - 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 Lassen County will actually do.
What a system would cost here
With 91.6% of Lassen 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.
How Lassen County, CA compares
Nationally, Lassen County, CA is the 1,099-most-constrained of 3,058 rated counties for septic soil. Within California alone it ranks 31 of 57.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems