Suwanee Water Hardness & Quality Report (2026)

Suwanee, Georgia, in Gwinnett County — a Gwinnett County city adjacent to Duluth and Sugar Hill, in the north Gwinnett County suburban corridor of the greater Atlanta metro — receives its municipal water from Gwinnett County Department of Water Resources, drawing from Lake Lanier (on the Chattahoochee River, Hall County) or from the Chattahoochee River directly through the Gwinnett County treatment facilities.

The moderately hard 131 mg/L hardness and TDS of 317.0 mg/L are harder than the upper Chattahoochee or Lake Lanier source water alone (typically 30-60 mg/L — the Blue Ridge crystalline watershed is soft), suggesting that the Gwinnett County water system's extensive treatment process and distribution infrastructure contribute to the higher tap measurements, or that the Suwanee distribution zone receives water with greater mineral contact. The Gwinnett County supply is typical of the north Atlanta metro corridor.

At 131 mg/L, Suwanee's water is moderately hard — scale builds in kettles and appliances over months, dishwashers benefit from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling is appropriate. The PFAS level of 8.1 ppt warrants a certified reverse osmosis drinking water filter — Dobbins Air Reserve Base (Marietta, Cobb County — AFFF in the Chattahoochee watershed), the Atlanta metro PFAS industrial complex, and the north Georgia carpet-manufacturing legacy (Dalton PFAS corridor upstream) contribute to Suwanee's elevated readings.