Septic suitability in Santa Cruz County, AZ
Very limited
USDA puts Santa Cruz County, AZ at "Very limited" for septic absorption fields, the dominant reading across 74.7% of the county's soil. That reading means a conventional system is a poor bet here - 74.7% of Santa Cruz County lands in the strictest "very limited" bucket USDA uses. The county spans 1,236.26 square miles, home to 50,508 people.
What this number does and doesn't tell you
This is a countywide, area-weighted figure across every soil survey map unit in Santa Cruz County, AZ - never a reading for one specific parcel. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Santa Cruz County: conventional vs. engineered cost
74.7% of Santa Cruz 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.
Where this sits nationally
Among the 3,058 rated counties on this site, Santa Cruz County, AZ ranks 2,296 most-constrained nationally, and 7 of 15 within Arizona.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems