Coconino County's SSURGO septic rating

Very limited

Coconino County, AZ: USDA's soil survey calls 72.1% of the county "Very limited" for a septic leach field. That reading means a conventional system is a poor bet here - 72.1% of Coconino County lands in the strictest "very limited" bucket USDA uses. The county spans 18,616.366 square miles, home to 145,161 people.

What this number does and doesn't tell you

USDA's survey covers the whole of Coconino County, AZ 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.

Coconino County: conventional vs. engineered cost

72.1% of Coconino 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, Coconino County, AZ ranks 2,398 most-constrained nationally, and 8 of 15 within Arizona.

Before you act on this

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