Guilford County, NC: the USDA septic-suitability picture

Very limited

USDA puts Guilford County, NC at "Very limited" for septic absorption fields, the dominant reading across 62.5% of the county's soil. Expect the ground itself to work against a plain gravity system; USDA's strictest bucket alone covers 62.5% of the county. For scale: 645.993 square miles and 558,816 people call Guilford County home.

Before you rely on this for one lot

Nothing about Guilford County, NC'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 Guilford County, NC

Guilford 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, Guilford County, NC ranks 2,676 most-constrained nationally, and 66 of 97 within North Carolina.

Before you act on this

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