Wilkes County, NC's soil, for a septic absorption field
Very limited
90.3% of Wilkes County, NC's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. That reading means a conventional system is a poor bet here - 90.3% of Wilkes County lands in the strictest "very limited" bucket USDA uses. Wilkes County, NC is 753.678 square miles with a population of 66,186.
What Wilkes County's reading doesn't cover
Two lots a mile apart in Wilkes County can carry different soil, even though they share one countywide rating. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Wilkes County will actually do.
What a system would cost here
With 90.3% of Wilkes County rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.
How Wilkes County, NC compares
Nationally, Wilkes County, NC is the 1,230-most-constrained of 3,058 rated counties for septic soil. Within North Carolina alone it ranks 21 of 97.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems