Athens Water Hardness & Quality Report (2026)

Athens, Georgia — home to the University of Georgia — draws its municipal water supply from the Athens-Clarke County Water Treatment Facility, sourcing from the North Oconee River via two key impoundments: the North Oconee River Reservoir (Bear Creek Reservoir) on the main North Oconee River, and smaller intake structures on tributaries in Clarke and Jackson Counties. The North Oconee River drains the Georgia Piedmont northeast of Athens. Athens-Clarke County operates the water treatment plant producing finished water for the Athens-Clarke County Unified Government service area. Water hardness measures 98.5 mg/L — classified as moderately soft.

Athens' moderately soft supply reflects the low-calcium metamorphic and igneous geology of the Georgia Piedmont in the North Oconee watershed. The North Oconee River drains the Georgia Piedmont Province — underlain by Precambrian–Ordovician high-grade metamorphic rocks: the Corbin Metagranite, Tugaloo Terrane gneiss, and Chatooga Terrane amphibolite and schist formations of the southern Appalachian Piedmont. These ancient crystalline rocks, product of high-grade metamorphism and granite intrusion during Taconic and Acadian orogenies, are geochemically depleted of soluble calcium and magnesium, contributing minimal carbonate minerals to river drainage. The warm, humid Georgia climate produces substantial runoff that dilutes the modest mineral content of these siliceous rocks.

At 98.5 mg/L, Athens residents experience moderate scale accumulation over time. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is sufficient maintenance. Dishwashers produce clean glassware with moderate rinse-aid use. Hot water systems accumulate minimal scale. Athens-Clarke County Water Treatment Facility consistently delivers water meeting all Georgia EPD and EPA Safe Drinking Water Act requirements.