Acworth Water Hardness & Quality Report (2026)

Acworth, Georgia, in Cobb County at the northern shore of Lake Allatoona — a rapidly growing Cobb County community with direct Lake Allatoona waterfront access and the historic Acworth Beach public swimming area on the reservoir — receives its municipal water from the Cobb County-Marietta Water Authority (CCMWA), which draws from Lake Allatoona (a U.S. Army Corps of Engineers reservoir on the Etowah River) as its primary surface water intake. The CCMWA operates one of the metro Atlanta area's most significant water treatment facilities at the Lake Allatoona intake.

The moderately hard 137.5 mg/L hardness and TDS of 346.2 mg/L reflect Lake Allatoona's watershed geology at the transition between the Blue Ridge and Valley and Ridge provinces. The Etowah River drains northward from the Blue Ridge Province of north Georgia — where Precambrian and early Paleozoic metasedimentary and volcanic rocks (including the Dahlonega Gold Belt and Blue Ridge basement complex) produce soft, low-mineral runoff — before entering the Valley and Ridge Province near Cartersville, where the watershed intersects Ordovician Knox Dolomite and Cambrian limestone carbonate formations. The carbonate inputs from the Valley and Ridge transitional zone add moderate hardness to the Etowah supply as it flows into Lake Allatoona.

At 137.5 mg/L, Acworth's water is moderately hard — consistent with the north Cobb County Etowah-Allatoona 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 the standard schedule. The elevated PFAS level of 8.6 ppt warrants a certified drinking water filter — the Cobb County-Marietta corridor's Dobbins Air Reserve Base (a significant AFFF firefighting foam user), the Lockheed Martin Marietta aircraft manufacturing complex, and the broader Atlanta metropolitan industrial corridor contribute to elevated PFAS in the Lake Allatoona supply.