Westport Water Hardness & Quality Report (2026)

Town of Westport Water Department supplies drinking water to approximately 27,000 residents across coastal Fairfield County, Connecticut. The utility sources water from multiple groundwater wells tapping stratified-drift aquifers near the Saugatuck River and Aspetuck River valleys. Primary treatment occurs at the Westport Water Treatment Plant, involving filtration, chlorination, corrosion control, and pH adjustment. Aquarion Water Company of CT provides service to parts of Westport Village under the Main System, serving 351,756 people regionally. Distribution covers the full 21-square-mile municipality including the Compo Beach area.

The watershed encompasses the lower Housatonic River basin and adjacent coastal tributaries draining into Long Island Sound. Groundwater recharges through permeable glacial sands and gravels overlying fractured schist, gneiss, and Stockbridge Limestone outliers of the Berkshire Highlands geological province. These bedrock units — including Cambrian-Ordovician Hartland Formation gneisses — impart a hard supply character via mineral leaching; clay layer confinement of the coastal aquifer increases contact time with mineral-rich strata, elevating dissolved solids.

Hard water leads to moderate scale buildup in water heaters, dishwashers, and coffee makers, reducing efficiency by 20–30% and increasing energy costs. Soap scum forms on fixtures and laundry may appear dingy. Annual descaling of heaters and monthly vinegar soaks for showerheads are recommended. A water softener is advised to extend appliance life and improve cleaning. The 2023 Annual Drinking Water Quality Report confirms no MCL violations; Westport Village tap water exceeds EPA health guidelines (MCLGs) for 2 contaminants, prompting filter recommendations for PFAS and vulnerable groups. No recent lead or copper issues are reported.