What Calaveras County, CA's soil rates for a septic system
Very limited
91.8% of Calaveras County, CA'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 91.8% of Calaveras County's land. Calaveras County, CA is 1,020.016 square miles with a population of 46,505.
What Calaveras County's reading doesn't cover
Two lots a mile apart in Calaveras County can carry different soil, even though they share one countywide rating. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Calaveras County will actually do.
What a system would cost here
With 91.8% of Calaveras 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 Calaveras County, CA compares
Nationally, Calaveras County, CA is the 1,065-most-constrained of 3,058 rated counties for septic soil. Within California alone it ranks 28 of 57.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems