Tewksbury Water Hardness & Quality Report (2026)

Tewksbury Water Department serves approximately 30,730 residents in Tewksbury, Massachusetts, located in Middlesex County. The utility purchases surface water treated via conventional methods including chlorination and chloramination at facilities associated with regional suppliers. The mailing address is 121 Glen Road, Wilmington, MA 01887, reachable at 978-658-4711. Sources draw primarily from the Merrimack River watershed, with potential groundwater components from private wells; the supply undergoes conventional filtration and disinfection meeting state and federal standards, with annual Consumer Confidence Reports published for residents.

The supply originates from the Merrimack River watershed, encompassing glacial till and metamorphic rock formations such as those in the Nashoba terrane from Paleozoic eras. Local aquifers include stratified drift deposits overlying bedrock, imparting a moderately mineralised character due to calcium and magnesium leaching from sedimentary and igneous layers. Eastern coastal geology with ample precipitation yields less aggressive mineral content compared to inland areas, shaping a balanced but firm water profile.

Moderately hard water promotes scale buildup in water heaters, dishwashers, and washing machines, reducing efficiency and lifespan. Plumbing fixtures, faucets, and showerheads may clog, while soap scum affects cleaning. Regular deliming every 1–2 years and installing a water softener is recommended for households noticing spotting on glassware or dry skin. The utility reports 4 contaminants above EPA health-based guidelines and 1 MCL violation, with TTHM levels rising in summer; finished water stays below the PFAS MCL of 20 ng/L.