Septic soil in Alleghany County, VA, by the numbers

Very limited

Soil across 91% of Alleghany County, VA rates "Very limited" in USDA's septic-absorption-field interpretation. This is the reading that pushes a project toward an engineered system rather than a conventional one, and it covers 91% of Alleghany County's land. Alleghany County, VA is 446.572 square miles with a population of 14,632.

What Alleghany County's reading doesn't cover

Alleghany County's rating is an average across the whole county, not a promise about any one lot inside it. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Alleghany County will actually do.

What a system would cost here

With 91% of Alleghany 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.

Where this sits nationally

Nationally, Alleghany County, VA is the 1,168-most-constrained of 3,058 rated counties for septic soil. Within Virginia alone it ranks 12 of 110.

Before you act on this

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