Swansea Water Hardness & Quality Report (2026)

Swansea Water District is a municipal utility serving approximately 17,959 residents in Swansea, Massachusetts (Bristol County). The system operates twelve wells — ten active, two inactive — and one surface water source, served by three treatment plants distributed across the service area. Administrative offices are at 700 Wilbur Avenue, Swansea, MA 02777; contact: 508-672-9746. Treatment methods include aeration, disinfection, dissolved air flotation, and filtration. The district has reported five contaminants above EPA health-based guidelines (MCLGs) and five MCL violations on record, with ongoing remediation efforts to address water quality concerns.

The Swansea supply draws from the Rhode Island–Massachusetts groundwater aquifer system and surface water sources typical of southeastern Massachusetts. Underlying geology consists of Precambrian metamorphic bedrock — gneiss and schist — overlain by glacial deposits of sand, gravel, and clay. This glacial-drift aquifer naturally contains elevated iron and manganese, which dissolve into groundwater and adhere to the interior of aging cast-iron water mains (6–12 inches diameter, 124 miles total), causing discoloration during system disturbances and shaping the utility's moderately mineralised supply profile.

At moderately hard levels, residents may experience scale buildup in kettles, reduced soap effectiveness, and mineral deposits on appliances and fixtures. Water heaters and dishwashers are particularly vulnerable and require periodic descaling. The utility has conducted repeated ice-pigging operations — using a 25 °F ice slurry forced through mains under high pressure — to remove accumulated sediment from pipes. A whole-house water softener may benefit households with sensitive appliances or high hot-water usage. Residents experiencing discolored cold water should flush outdoor spigots; persistent discoloration warrants contacting the utility.