Gates County's SSURGO septic rating
Very limited
USDA puts Gates County, NC at "Very limited" for septic absorption fields, the dominant reading across 98.1% of the county's soil. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 98.1% of the county. The county spans 340.612 square miles, home to 10,299 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Gates County, NC 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.
Gates County: conventional vs. engineered cost
98.1% of Gates 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, Gates County, NC ranks 240 most-constrained nationally, and 1 of 97 within North Carolina.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems