Local Soil Conditions: Florence County soils are dominated by Goldsboro sandy loam, Norfolk sandy loam, and Lynchburg sandy loam — Ultisols (Hapludults and Paleudults) formed in loamy Coastal Plain sediments of the Upper Coastal Plain. The Goldsboro series is a moderately well-drained Aquic Paleudult with a sandy loam surface transitioning to a sandy clay loam Bt horizon at 8–20 inches — percolation rates of 0.5–1.5 inches per hour, suitable for conventional systems. Norfolk sandy loam on well-drained uplands has a friable sandy clay loam Bt with moderate permeability. Lynchburg soils in the interstream flats are poorly drained with seasonal high water tables at 12–24 inches. The Great Pee Dee River floodplain adds Chastain and Altavista soils.
Water Table: Florence County's Upper Coastal Plain setting provides generally good drainage on upland positions: Norfolk and Goldsboro series maintain water tables at 3–6 feet. Poorly drained interstream flats (Lynchburg and Rains soils) have seasonal high water tables at 12–24 inches. DHEC requires adequate seasonal high water table separation demonstrated by a Licensed Soil Classifier.
Climate Impact: Florence has a humid subtropical climate with hot, humid summers and mild winters. Annual rainfall averages 46 inches, distributed through the year with summer afternoon thunderstorms. Hurricane Florence (2018) caused catastrophic flooding in the Pee Dee region — including record flooding of the Great Pee Dee River — damaging numerous septic systems across Florence County. The region's agriculture-dominant landscape creates seasonal patterns in surface water and soil moisture.