Weymouth Water Hardness & Quality Report (2026)

Weymouth, Massachusetts, in Norfolk County south of Boston on Quincy Bay — the birthplace of Abigail Adams, a major South Shore Massachusetts suburban community, home of the former South Weymouth Naval Air Station (South Shore Park redevelopment) and a diverse working-class and suburban South Shore community — draws its municipal water supply from local South Shore watershed reservoirs via the Aquarion Water Company of Massachusetts and the Weymouth–Braintree Regional Water Treatment Plant. Water hardness in Weymouth measures 91.5 mg/L — classified as moderately soft.

Weymouth's moderate softness reflects the Norfolk County South Shore Massachusetts watershed's coastal plain glaciofluvial geology. The Weymouth–Braintree watershed drains: the Norfolk County glaciofluvial outwash plain (Wisconsin Age Braintree–Weymouth coastal outwash sand and gravel — quartz-dominant, derived from the New England Crystalline Massif Dedham Granite and Boston Bay Group calcareous Cambridge Argillite); the Fore River coastal drainage (Quincy–Weymouth coastal watershed); and the Cranberry Meadow and Whitman Pond reservoir system. The predominantly siliceous coastal plain outwash and Dedham Granite crystalline terrain produces the moderate 91.5 mg/L at Weymouth.

With hardness at 91.5 mg/L, Weymouth residents enjoy moderately soft water with minimal scale challenges. Aquarion Water Company consistently delivers water meeting all Massachusetts MassDEP and EPA Safe Drinking Water Act requirements.