Septic soil in Roanoke County, VA, by the numbers

Very limited

Soil across 76.2% of Roanoke County, VA rates "Very limited" in USDA's septic-absorption-field interpretation. That reading means a conventional system is a poor bet here - 76.2% of Roanoke County lands in the strictest "very limited" bucket USDA uses. Roanoke County, VA is 250.549 square miles with a population of 97,334.

What Roanoke County's reading doesn't cover

This is a countywide, area-weighted figure across every soil survey map unit in Roanoke County, VA - 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 Roanoke County will actually do.

What a system would cost here

With 76.2% of Roanoke 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 Roanoke County, VA compares

Nationally, Roanoke County, VA is the 2,222-most-constrained of 3,058 rated counties for septic soil. Within Virginia alone it ranks 54 of 110.

Before you act on this

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