Calhoun Water Hardness & Quality Report (2026)

Calhoun, Georgia, in Gordon County — the Gordon County seat adjacent to Resaca and Adairsville on the Coosawattee River in the northwest Georgia Valley and Ridge — receives its municipal water from the Calhoun Water Division, drawing from the Coosawattee River (Gordon County) through the Calhoun treatment plant.

The moderately hard 100 mg/L hardness and TDS of 197.9 mg/L reflect the northwest Georgia Valley and Ridge carbonate character — harder than the Georgia Blue Ridge supplies (Gainesville: ~80 mg/L) but softer than the deep Tennessee Valley carbonate communities (Sevierville: 227.5 mg/L). The Coosawattee River at Gordon County drains the Georgia Valley and Ridge — Ordovician Knox Dolomite (the dominant Valley and Ridge carbonate platform — very high purity dolomite), Cambrian Rome Formation (calcareous shale and limestone), and Cambrian Conasauga Group (calcareous).

At 100 mg/L, Calhoun'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 5.9 ppt warrants a certified drinking water filter — the Gordon County northwest Georgia carpet manufacturing corridor (Calhoun is a major carpet and flooring production center — a significant industrial PFAS source in the Coosawattee watershed), and the northwest Georgia industrial PFAS background contribute to Calhoun's readings.