McDowell County, WV's soil, for a septic absorption field

Very limited

Soil across 96.7% of McDowell County, WV rates "Very limited" in USDA's septic-absorption-field interpretation. Practically, that rules out a simple gravity system for most of the county - 96.7% of it sits in USDA's most-constrained bucket. McDowell County covers 533.459 square miles and counts 17,147 residents.

This is a county figure, not a parcel figure

McDowell County's rating is an average across the whole county, not a promise about any one lot inside it. A site-specific perc test, usually $750-$1,850, is what a health department will actually require before permitting a lot in McDowell County.

System cost, conventional vs. engineered

Given McDowell County's rating, plan for the engineered-system range rather than the conventional one. 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 McDowell County, WV compares

Nationally, McDowell County, WV is the 418-most-constrained of 3,058 rated counties for septic soil. Within West Virginia alone it ranks 20 of 55.

Related guides

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