Linden Water Hardness & Quality Report (2026)

New Jersey American Water operates the Raritan System (PWSID NJ2004002), serving Linden in Union County alongside Clark, Cranford, Garwood, and surrounding communities. Water is sourced from seven intakes on the Raritan River, Millstone River, and Delaware & Raritan Canal. Treatment occurs at facilities including the Raritan-Millstone Water Treatment Plant, where coagulation, sedimentation, filtration, and disinfection ensure compliance with state and federal drinking water standards. The utility maintains corrosion control measures and publishes annual Consumer Confidence Reports covering service area water quality.

The Raritan River watershed spans 1,100 square miles across the Piedmont and Coastal Plain physiographic provinces, draining into Raritan Bay. Underlying geology transitions from metamorphic and igneous rocks in the north to unconsolidated sands and clays of the Raritan Formation (Cretaceous) and overlying Kirkwood Formation (Miocene). Limestone and dolomite lenses within these sediments leach moderate levels of calcium and magnesium into the rivers, producing moderately hard water at 104 mg/L from aquifer interactions and surface runoff.

At 104 mg/L, Linden's moderately hard water promotes scale buildup in pipes, water heaters, dishwashers, and washing machines over time. Boilers and coffee makers are particularly susceptible, and glassware spotting is common. Regular vinegar descaling, drain screens, and detergent boosters help mitigate effects. A water softener is optional but recommended for households noticing soap scum or dry skin. Typical pH ranges 6.5–8.5; sodium 31–36 mg/L; 7 contaminants above EPA MCLGs are noted, with filtration recommended.