Brockton Water Hardness & Quality Report (2026)

Brockton, Massachusetts, in Plymouth County in southeastern Massachusetts, draws its municipal water supply through the City of Brockton Water Department, sourcing from a network of protected reservoir catchments in the Plymouth County sandy outwash plain: the Aqua Vitae Reservoir, Brockton's Ames Pond, and associated Silver Lake watershed system in Plymouth County. The watershed is characterised by the broad Plymouth–Carver outwash plain — a major Pleistocene glacial outwash deposit. Water hardness measures 63.5 mg/L — classified as moderately soft.

Brockton's moderately soft supply reflects the geology of Southeastern Massachusetts. The Plymouth County watershed drains the Plymouth–Carver Outwash Aquifer — a large glaciofluvial outwash deposit of sand and gravel — and the underlying Precambrian Dedham Granodiorite and Taunton River Gneiss of the southeastern Massachusetts coastal plain. These outwash sands have minimal calcium carbonate content — essentially washed and sorted quartz and feldspar sand and gravel derived from glacially ground New England granite. The Precambrian granodiorite basement is similarly calcium-poor, and the flat, wet southeastern Massachusetts landscape produces naturally soft rainfall-dominated water supply.

With hardness at 63.5 mg/L, Brockton residents experience minimal to moderate scale challenges. Faucet aerators and showerheads develop deposits slowly — bi-monthly cleaning with citric acid solution is sufficient. Dishwashers produce clean glassware. City of Brockton Water Department consistently delivers water meeting all Massachusetts DEP and EPA Safe Drinking Water Act requirements.