Gaston County, NC: the USDA septic-suitability picture

Somewhat limited

Gaston County, NC: USDA's soil survey calls 54.9% of the county "Somewhat limited" for a septic leach field. Modification usually rescues a conventional system at this rating - added fill or a larger field - rather than forcing a full engineered redesign. The county spans 355.751 square miles, home to 242,010 people.

What this number does and doesn't tell you

Two lots a mile apart in Gaston County can carry different soil, even though they share one countywide rating. Budget $750-$1,850 for a real perc test on any specific parcel - that's the only figure a permit application accepts.

Gaston County: conventional vs. engineered cost

54.9% of Gaston County carrying a "Somewhat 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.

Gaston County's rank among North Carolina counties

Among the 3,058 rated counties on this site, Gaston County, NC ranks 2,979 most-constrained nationally, and 92 of 97 within North Carolina.

Before you act on this

How this rating is built, and its real limits · How a percolation test actually works