Sterling Heights Water Hardness & Quality Report (2026)

City of Sterling Heights Water Department serves over 130,000 residents across approximately 37 square miles in Macomb County, Michigan. Water is sourced from the Detroit Water and Sewerage Department (DWSD), which supplies treated surface water from the Detroit River — within the Lake St. Clair and connected river systems including the Clinton, Rouge, and Ecorse Rivers — or the lower Lake Huron. Treatment occurs at DWSD's four facilities: Water Works Park, Springwells, N.W. Goldwater, and Lake Huron plants, using conventional coagulation, sedimentation, filtration, and disinfection before distribution through Sterling Heights' infrastructure.

The supply originates in the Detroit River and Lake Huron watersheds, spanning U.S. and Canadian tributaries amid Paleozoic bedrock of Devonian-age limestones, dolomites, and shales. Glacial deposits overlay these formations, facilitating mineral dissolution into surface waters and imparting a hard character through natural leaching of calcium and magnesium from carbonate-rich rocks. The Detroit River intakes are highly susceptible to contaminants due to karst features and land use, contrasted by moderate vulnerability in Lake Huron.

Hard water leads to scale buildup in pipes and fixtures, most affecting water heaters, dishwashers, washing machines, and coffee makers by reducing efficiency and lifespan; soap lathering is diminished, causing dry skin and laundry stiffness. Regular descaling, installing drain screens, and flushing hot water tanks are recommended; a water softener is advised to mitigate these effects and extend plumbing life. Water meets or exceeds EPA and Michigan EGLE standards per the 2021 Consumer Confidence Report; fluoride is added for dental health, treatment includes disinfection and filtration, and tap water is confirmed safe by the utility.