Troy Water Hardness & Quality Report (2026)

The City of Troy Water Department serves approximately 26,000 residents in Miami County, Ohio, primarily within city limits and select surrounding areas. Water is sourced from the Great Miami River and treated at the Troy Water Treatment Plant, which processes an average of 4 million gallons daily. The utility maintains rigorous monitoring including hourly process controls, with biennial Consumer Confidence Reports available at troyohio.gov/ccr.

The Great Miami River watershed spans 6,700 square miles, draining Devonian-age limestone and dolomite formations including the Columbus Limestone. These soluble carbonate rocks dissolve to impart a hard character, with calcium and magnesium prevalent throughout the supply. Glacial till and outwash deposits from the Pleistocene era overlay these formations, influencing recharge to shallow aquifers that blend with surface water and enhance mineral content — a mineralised profile common to Ohio's interior limestone terrains.

Hard water in Troy leads to scale buildup in pipes, water heaters, dishwashers, and washing machines, producing white deposits, spotty glassware, and soap scum. Periodic vinegar descaling, drain screens, and high-efficiency detergents help reduce these effects; a water softener is recommended to extend appliance life. Treatment includes conventional coagulation, sedimentation, filtration, and disinfection — recently upgraded to sodium hypochlorite by late 2026. No fluoride is added per voter decision. Water Quality Reports confirm EPA compliance for pH (7–8) and lead/copper below action levels; no notable PFAS or contaminant violations are reported, with total hardness and alkalinity tested routinely.