Septic soil in Boone County, WV, by the numbers
Very limited
Soil across 97.4% of Boone County, WV rates "Very limited" in USDA's septic-absorption-field interpretation. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 97.4% of the county. Boone County, WV is 502.37 square miles with a population of 20,496.
What Boone County's reading doesn't cover
Nothing about Boone County, WV's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Boone County will actually do.
What a system would cost here
With 97.4% of Boone 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.
Boone County's rank among West Virginia counties
Nationally, Boone County, WV is the 335-most-constrained of 3,058 rated counties for septic soil. Within West Virginia alone it ranks 14 of 55.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems