Brockton Water Hardness & Quality Report (2026)

The Brockton Water Commission serves as the municipal water utility for approximately 100,000 residents in Plymouth County, Massachusetts. Water sources include surface water from the Silver Lake Watershed, featuring Silver Lake and associated reservoirs like Matfield Pond, supplemented by groundwater wells. Treatment is conducted at the Silver Lake Water Treatment Plant, applying conventional processes including coagulation, sedimentation, filtration, and disinfection with chloramine. The utility also coordinates with the Whitman Water System for parts of the service area.

The Silver Lake Watershed spans approximately 12 square miles in southeastern Massachusetts, underlain by glacial till and outwash plains from the last Ice Age. Aquifers in the stratified drift deposits of the Cape Cod aquifer system are present nearby, while the Cape Cod Bay Complex and Buzzards Bay Moraine represent Quaternary glacial formations from the Wisconsinan glaciation, composed of sand, gravel, and clay-rich sediments. This geology lacks extensive limestone or dolomite, yielding a characteristically soft supply with minimal dissolution of hardness ions, though some iron and manganese may derive from organic-rich sediments.

As soft water, Brockton's supply causes minimal scale buildup on pipes, fixtures, and appliances such as water heaters and dishwashers, reducing maintenance needs compared to harder regions. Soap lathers easily without excess, and no softening equipment is typically recommended. Routine flushing of hot water systems prevents sediment accumulation from natural minerals. Water quality testing shows compliance with federal standards, though contaminants including bromodichloromethane exceed health guidelines per recent reports; PFAS presence prompts filter recommendations. Treatment uses chloramination, and lead/copper rule compliance is maintained through corrosion control.