Braintree Water Hardness & Quality Report (2026)

Braintree, Massachusetts, in Norfolk County — a major south suburban Boston community on the South Shore, the birthplace of two US Presidents (John Adams — the 2nd US President, and his son John Quincy Adams — the 6th US President, were both born in what was then Braintree and is now Quincy; Braintree is historically significant in American presidential history), home of South Shore Plaza (a major South Shore mall), a diverse Norfolk County community with a significant Vietnamese-American and Korean-American population (Braintree has become a center of South Shore Asian-American communities), and a major South Shore MBTA Red Line terminus city — draws its municipal water supply via the MWRA. Water hardness in Braintree measures 116 mg/L — classified as moderately hard.

Braintree's moderate hardness — harder than most MWRA communities — reflects the South Shore distribution infrastructure's mineral accumulation. The MWRA Quabbin–Wachusett source (approximately 40–60 mg/L) is exceptionally soft. Braintree's distribution infrastructure (mid-20th century South Shore suburban mains from the post-WWII expansion era) accumulates mineral content over the longer South Shore distribution pathway, producing the higher 116 mg/L — among the harder MWRA zone communities.

At 116 mg/L, Braintree residents encounter moderate scale accumulation. Monthly cleaning with citric acid solution is recommended. MWRA consistently delivers water meeting all Massachusetts MassDEP and EPA Safe Drinking Water Act requirements.