Burlington Water Hardness & Quality Report (2026)

Burlington Water Department serves approximately 26,237 residents in Burlington, Massachusetts, in Middlesex County. The utility sources water from surface water reserves, treated at facilities including the Vine Brook Water Treatment Plant on Middlesex Turnpike and the Mill Pond Treatment Plant, using chloramine disinfection and filtration. Plans are advancing to connect to the Massachusetts Water Resources Authority (MWRA) system by closing the Vine Brook plant and integrating Quabbin Reservoir water into the distribution network.

The watershed encompasses the Nashua River Basin and local tributaries like Vine Brook, feeding into surface reservoirs around Mill Pond. Underlying geology features Paleozoic metamorphic rocks of the Merrimack Synclinorium, including schists and quartzites from the Marlboro Formation and Berwick Formation that release minerals into surface flows. This Appalachian terrain, shaped by glacial deposits, imparts a moderately mineralised profile. Transitioning to MWRA's Quabbin watershed will introduce water from similar New England bedrock, sustaining moderate mineral content without drastic shifts.

As moderately hard water, Burlington's supply promotes moderate scale buildup in water heaters, dishwashers, and pipes, with visible deposits on faucets and reduced soap lathering. Maintenance includes keeping hot water below 140°F, regular flushing of tanks, vinegar descaling, and adding rinse aids in laundry. A whole-house softener is not typically required at this hardness level but may benefit households noticing scaling or spotting. Notably, recent tests detected PFAS at 40 parts per trillion, exceeding Massachusetts' 20 ppt standard, prompting advisories for vulnerable groups (pregnant, nursing, infants) against consumption; new filters at Mill Pond and full MWRA connection are planned to address this.