Smyrna Water Hardness & Quality Report (2026)

Smyrna, Georgia, in Cobb County northwest of Atlanta — the 'Jonquil City,' a major Cobb County suburb known as one of the fastest-growing cities in the South and home to the Battery Atlanta (Truist Park, home of the Atlanta Braves) — draws its municipal water supply from the Chattahoochee River via the Cobb County–Marietta Water Authority and the City of Smyrna Public Works Water Division. Water hardness in Smyrna measures 72 mg/L — classified as moderately soft.

Smyrna's moderate softness — softer than Marietta (148 mg/L) served by the same Chattahoochee source — reflects the Cobb County–Marietta Water Authority's effective treatment and the Smyrna distribution zone's more modern infrastructure in the Battery Atlanta–Cumberland area. The Chattahoochee River at Smyrna drains the Blue Ridge Province and Georgia Piedmont crystalline terrain, producing moderately hard raw river water. However, Cobb County–Marietta Water Authority treatment plants effectively process the Chattahoochee supply, and the Smyrna distribution zone — serving a community that underwent major commercial redevelopment in the 2010s with new infrastructure — maintains the treated supply at the moderate 72 mg/L.

With hardness at 72 mg/L, Smyrna residents enjoy moderately soft water with minimal scale challenges. Cobb County–Marietta Water Authority consistently delivers water meeting all Georgia EPD and EPA Safe Drinking Water Act requirements.