Septic suitability in Washington County, AL

Very limited

Washington County, AL: USDA's soil survey calls 89.6% of the county "Very limited" for a septic leach field. Practically, that rules out a simple gravity system for most of the county - 89.6% of it sits in USDA's most-constrained bucket. For scale: 1,080.255 square miles and 15,018 people call Washington County home.

Before you rely on this for one lot

Nothing about Washington County, AL's SSURGO figure applies to a specific address - it's a county-wide average. The real answer for one lot is still a site-specific perc test, running about $750-$1,850 (typically near $1,300).

Budgeting for a system in Washington County, AL

Washington County's soil reading pushes the likely outcome toward an engineered system rather than a conventional one. 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.

Where this sits nationally

Among the 3,058 rated counties on this site, Washington County, AL ranks 1,314 most-constrained nationally, and 14 of 67 within Alabama.

Further reading

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