Septic soil in Barbour County, WV, by the numbers
Very limited
97.7% of Barbour County, WV'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 - 97.7% of Barbour County lands in the strictest "very limited" bucket USDA uses. Barbour County, WV is 341.059 square miles with a population of 15,369.
What Barbour County's reading doesn't cover
This is a countywide, area-weighted figure across every soil survey map unit in Barbour County, WV - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Barbour County will actually do.
What a system would cost here
With 97.7% of Barbour 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.
Barbour County's rank among West Virginia counties
Nationally, Barbour County, WV is the 293-most-constrained of 3,058 rated counties for septic soil. Within West Virginia alone it ranks 11 of 55.
Further reading
How this rating is built, and its real limits · Conventional vs. engineered septic systems