Everett Water Hardness & Quality Report (2026)

The Everett Water Department, operating under the Massachusetts Water Resources Authority (MWRA), serves approximately 49,075 residents in Everett, Middlesex County, Massachusetts. Water is purchased from MWRA's system, primarily sourced from the Quabbin Reservoir (primary) and Wachusett Reservoir (secondary), both in central Massachusetts. Treatment occurs at the John J. Carroll Water Treatment Plant in Marlborough, MA, employing ozone, UV light, chloramines, and hypochlorite disinfection. The utility maintains no MCL violations and complies with EPA standards across all tested contaminants.

The Quabbin and Wachusett Reservoirs are protected within the Ware and Swift River watersheds, spanning 170 square miles of forested land with strict no-development policies. Underlying geology consists of Paleozoic metamorphic schists — specifically the Brimfield Schist and Paxton Schist — and granitic gneisses, with thin glacial overburden that limits mineral dissolution. This inert bedrock contributes few dissolved ions, yielding a very soft water character with naturally low concentrations of calcium and magnesium that requires minimal adjustment during treatment.

As soft water, Everett's supply produces negligible scale buildup, sparing appliances like water heaters, dishwashers, and coffee makers from mineral deposits. Soap and detergent efficiency is high, with no need for extra usage to combat hardness; routine maintenance is minimal and no descaling is required. A water softener is not recommended and could unnecessarily strip beneficial minerals or introduce sodium. In September 2022 MWRA sampling for Everett, lead 90th percentile was 11.4 ppb (below the 15 ppb Action Level) and copper 72.1 ppb (below 1300 ppb AL); PFAS shows no exceedances per available data, and treatment includes ozonation, UV, and chloramine disinfection with pH adjustment for corrosion control.