Bennington County, VT's soil, for a septic absorption field
Very limited
96.1% of Bennington County, VT's surveyed soil comes back "Very limited" in USDA's own SSURGO data, the county's dominant condition for a septic absorption field. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 96.1% of the county. Bennington County, VT is 674.237 square miles with a population of 37,039.
What Bennington County's reading doesn't cover
Nothing about Bennington County, VT's SSURGO figure applies to a specific address - it's a county-wide average. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Bennington County will actually do.
What a system would cost here
With 96.1% of Bennington 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 Bennington County, VT compares
Nationally, Bennington County, VT is the 511-most-constrained of 3,058 rated counties for septic soil. Within Vermont alone it ranks 3 of 13.
Before you act on this
How this rating is built, and its real limits · Conventional vs. engineered septic systems