Brighton Water Hardness & Quality Report (2026)

Brighton, Massachusetts, a neighborhood in Boston's west end — a diverse Boston neighborhood with a large student population (Boston College, Boston University BU Medical campus vicinity, and numerous other universities have students living in Brighton), significant Irish-American and Brazilian-American communities, and a lively Brighton Center commercial district — receives its municipal water supply from the Quabbin Reservoir via the Massachusetts Water Resources Authority (MWRA), distributed to Brighton as part of the Boston Water and Sewer Commission (BWSC) network. Water hardness in Brighton measures 60 mg/L — classified as moderately soft.

Brighton's moderate softness — slightly harder than Everett (39 mg/L) on the same MWRA supply — reflects the BWSC Brighton distribution zone's mineral accumulation from the aged Boston distribution infrastructure. The MWRA Quabbin supply delivers very soft water (approximately 17–40 mg/L before treatment) to Boston. However, Brighton's urban distribution infrastructure includes cast-iron mains from the late 19th and early 20th century Boston neighborhood buildout period (Brighton was annexed by Boston in 1873). These older Boston mains accumulate more mineral content than newer suburban zones, producing the moderate 60 mg/L — harder than the raw MWRA supply but still relatively soft.

With hardness at 60 mg/L, Brighton residents enjoy moderately soft water. Boston Water and Sewer Commission consistently delivers water meeting all Massachusetts MassDEP and EPA Safe Drinking Water Act requirements.