Quincy Water Hardness & Quality Report (2026)

The Quincy Water Department provides drinking water to approximately 92,370 residents in Quincy, Norfolk County, Massachusetts. Water is purchased from the Massachusetts Water Resources Authority (MWRA), sourced from the Quabbin and Wachusett Reservoirs located west of Boston — a system supplying 51 communities with around 200 million gallons daily. Treatment occurs at MWRA facilities, including the John J. Carroll Water Treatment Plant near Wachusett Reservoir, employing ozonation, chloramination, and fluoridation. Both reservoir watersheds encompass over 100,000 acres of protected forestland in central Massachusetts, patrolled daily and tested frequently by state authorities.

The Quabbin and Wachusett watersheds overlie Paleozoic metamorphic rocks — schist, gneiss, and igneous granites of the Appalachian region — with minimal limestone or dolomite present. Thin soils limit deep mineral leaching, so dissolved calcium and magnesium derive primarily from surface-water contact with granitic bedrock. This produces moderately mineralised water: enough mineral content to impart character, but without the high hardness of carbonate-rich aquifer systems or the extreme softness of pristine crystalline terrain.

Moderately hard water in Quincy causes moderate scale buildup in appliances including water heaters, dishwashers, and washing machines, leaving spots on glassware and visible deposits on fixtures and kettles. Regular descaling and vinegar rinses for faucets are recommended; installing a water softener is advised for households noticing these effects. MWRA water complies with lead and copper rules, though older homes with lead pipes may benefit from point-of-use filters. Notable contaminants above health guidelines include bromodichloromethane, perchlorate, and possibly dibromoacetic acid, beryllium, and selenium. PFAS data is unavailable in reported sources.