Botetourt County, VA: the USDA septic-suitability picture
Very limited
USDA puts Botetourt County, VA at "Very limited" for septic absorption fields, the dominant reading across 80.2% of the county's soil. Practically, that rules out a simple gravity system for most of the county - 80.2% of it sits in USDA's most-constrained bucket. The county spans 541.276 square miles, home to 34,129 people.
What this number does and doesn't tell you
USDA's survey covers the whole of Botetourt County, VA at once, not any single address. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.
Botetourt County: conventional vs. engineered cost
80.2% of Botetourt County carrying a "Very limited" reading changes the realistic budget here. Conventional systems run $3,000-$8,000 where they pass; where they don't, engineered alternatives (mound or aerobic treatment, whichever the health department requires) run $10,000-$40,000 - budget toward the higher figure until a perc test says otherwise.
How Botetourt County, VA compares
Among the 3,058 rated counties on this site, Botetourt County, VA ranks 2,032 most-constrained nationally, and 43 of 110 within Virginia.
Before you act on this
How this rating is built, and its real limits · Conventional vs. engineered septic systems