Saint Clair Shores Water Hardness & Quality Report (2026)

The City of St. Clair Shores Municipal Water Company serves approximately 59,715 residents in St. Clair Shores, Macomb County, Michigan. Water is sourced from surface water purchased from the Detroit River, with no on-site treatment or disinfection reported by the utility. The system operates under oversight from the Michigan Department of Environment, Great Lakes & Energy (EGLE) and complies with the Safe Drinking Water Act. No specific treatment plant names are detailed in available reports for this purchased water supply system.

The Detroit River watershed is part of the broader St. Clair River-Lake St. Clair system, draining into Lake Erie and influenced by glacial till, sands, and gravels over Devonian-age limestone and shale formations of the Detroit River Group. These carbonate bedrock layers naturally mineralize the river water, producing a hard supply character. The geology promotes mineral leaching without significant softening from organic acids or peat, maintaining elevated dissolved solids typical of Midwestern Great Lakes tributaries.

Moderately hard water can lead to moderate scale buildup in pipes, water heaters, and dishwashers, reducing efficiency and lifespan. Affected appliances include washing machines and faucets, where soap scum may form requiring more detergent. Regular maintenance such as deliming heaters every one to two years and installing sediment filters helps mitigate these effects. A water softener is recommended to improve lathering and protect plumbing. The 2026 water quality report indicates a score of 80/100, with 2 contaminants above EPA health guidelines but no MCL violations; detected substances include copper at 1.3 ppb from plumbing corrosion.