Yolo County, CA: the USDA septic-suitability picture

Very limited

Yolo County, CA: USDA's soil survey calls 96.1% of the county "Very limited" for a septic leach field. That reading means a conventional system is a poor bet here - 96.1% of Yolo County lands in the strictest "very limited" bucket USDA uses. The county spans 1,012.988 square miles, home to 225,251 people.

What this number does and doesn't tell you

USDA's survey covers the whole of Yolo County, CA at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Yolo County: conventional vs. engineered cost

96.1% of Yolo County carrying a "Very limited" reading changes the realistic budget here. 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.

Yolo County's rank among California counties

Among the 3,058 rated counties on this site, Yolo County, CA ranks 508 most-constrained nationally, and 9 of 57 within California.

Related guides

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