Franklin County, AL's soil, for a septic absorption field

Very limited

Soil across 93.7% of Franklin County, AL rates "Very limited" in USDA's septic-absorption-field interpretation. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 93.7% of the county. Franklin County, AL is 633.959 square miles with a population of 31,874.

What Franklin County's reading doesn't cover

Nothing about Franklin County, AL'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 Franklin County will actually do.

What a system would cost here

With 93.7% of Franklin 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 Franklin County, AL compares

Nationally, Franklin County, AL is the 838-most-constrained of 3,058 rated counties for septic soil. Within Alabama alone it ranks 7 of 67.

Before you act on this

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