Lumberton Water Hardness & Quality Report (2026)

Lumberton, North Carolina, in Robeson County — the Robeson County seat on the Lumber River (a North Carolina black water river designated a National Wild and Scenic River), a city with deep Lumbee Tribal Nation heritage and central-southeastern North Carolina significance — receives its municipal water from the Lumberton City Water System, which draws from the Lumber River through Lumberton's surface water treatment plant on the southeastern North Carolina Coastal Plain.

The moderately hard 120 mg/L hardness and TDS of 253.9 mg/L reflect the Lumber River watershed's southeastern Coastal Plain geology. The Lumber River drains the southeastern North Carolina Coastal Plain — a gently sloping landscape underlain by the Cretaceous Black Creek Formation (marine and brackish sands and silts), the Peedee Formation (calcareous marine sediments), and the overlying Tertiary Coastal Plain sequence. The Cretaceous Peedee Formation contains bioclastic calcareous (carbonate-rich) marine sediments that contribute moderate dissolved calcium and bicarbonate to the drainage, while the Black Creek Formation's marine sands add background dissolved minerals. The Lumber River's moderately hard character reflects this Coastal Plain calcareous sediment drainage, typical of southeastern Carolina river supplies.

At 120 mg/L, Lumberton's water is moderately hard — typical for a southeastern North Carolina Coastal Plain supply. Scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling of heating appliances is appropriate. The PFAS level of 6.3 ppt warrants a certified drinking water filter — the Lumber River watershed's agricultural and light industrial activity, the Robeson County corridor's chemical and manufacturing legacy, and the southeastern North Carolina military and industrial PFAS background all contribute to the Lumberton supply's moderate PFAS level.