Septic suitability in San Bernardino County, CA

Very limited

USDA puts San Bernardino County, CA at "Very limited" for septic absorption fields, the dominant reading across 82.1% of the county's soil. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 82.1% of the county. For scale: 20,068.42 square miles and 2,214,281 people call San Bernardino County home.

Before you rely on this for one lot

USDA's survey covers the whole of San Bernardino County, CA at once, not any single address. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in San Bernardino County, CA

San Bernardino County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.

Where this sits nationally

Among the 3,058 rated counties on this site, San Bernardino County, CA ranks 1,919 most-constrained nationally, and 48 of 57 within California.

Further reading

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