Hampton County, SC: the USDA septic-suitability picture
Very limited
Hampton County, SC's SSURGO dominant class comes back "Very limited", covering 85.5% of the county. That reading means a conventional system is a poor bet here - 85.5% of Hampton County lands in the strictest "very limited" bucket USDA uses. For scale: 559.975 square miles and 18,172 people call Hampton County home.
Before you rely on this for one lot
Two lots a mile apart in Hampton County can carry different soil, even though they share one countywide rating. 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 Hampton County, SC
Hampton 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.
Hampton County's rank among South Carolina counties
Among the 3,058 rated counties on this site, Hampton County, SC ranks 1,655 most-constrained nationally, and 13 of 46 within South Carolina.
Related guides
How this rating is built, and its real limits · Conventional vs. engineered septic systems