Piqua Water Hardness & Quality Report (2026)

The Piqua Municipal Water System, operated by the City of Piqua in Miami County, Ohio, serves approximately 20,000 residents across the city and surrounding areas. Water is sourced primarily from the Great Miami River, with supplementary groundwater wells. Treatment occurs at the Piqua Water Treatment Plant, which processes raw water through conventional methods including coagulation, sedimentation, filtration, and chlorine disinfection to meet Ohio EPA standards.

The Great Miami River watershed, part of the larger Ohio River Basin, drains a 5,400-square-mile area characterized by rolling glacial till plains and underlying Paleozoic sedimentary rocks. Key formations include Devonian limestone and dolomite — prevalent in west-central Ohio — and the Bass Islands Dolomite, which impart a hard character through mineral dissolution. Glacial aquifers in unconsolidated drift overlying these carbonate bedrocks also contribute, resulting in a moderately mineralised to hard supply influenced by the region's carbonate geology.

Very hard water leads to significant scale buildup in pipes, water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Fixtures like faucets can develop stubborn deposits, and frequent descaling is needed for affected appliances. Installing a water softener is strongly recommended to prevent damage and improve soap efficiency. Piqua's 2024 Water Quality Report confirms compliance with all Ohio EPA standards, with non-detectable microcystins and no violations since 2023; lead levels are low at 0.002 mg/L and copper rules are met; pH is typically neutral to slightly alkaline due to natural carbonate buffering.