East Hanover Water Hardness & Quality Report (2026)

The East Hanover Township Water Department supplies water to residents across roughly 16 square miles of Morris County, New Jersey. Their system utilizes a mix of sources, drawing from the Whippany River watershed and local reservoirs for surface water, along with groundwater wells that tap into bedrock aquifers. All water undergoes treatment at the township's own filtration plant, which employs standard processes like coagulation, sedimentation, filtration, and disinfection to ensure it meets all federal and state drinking water regulations. This independent utility manages its own infrastructure, distinct from larger regional providers.

The watershed itself lies within the Passaic River drainage and the rolling hills of the Piedmont physiographic province. Geologically, the area is underlain by Triassic sedimentary rocks belonging to the Newark Supergroup, including shales and sandstones of the Boonton Formation. Diabase intrusions from the Watchung Basalts are also present. These rock types, along with traces of carbonates and mafic rocks, release minerals like calcium and magnesium as water percolates through them, resulting in a moderately mineralized supply. Alluvial deposits found along river valleys can further influence the water chemistry.

With its moderately hard water, homeowners might notice scale gradually building up in appliances like water heaters, dishwashers, and washing machines, potentially reducing their efficiency over time. You may also see spotting on faucets and coffee makers, and soap may not lather quite as readily. To manage this, annual descaling of appliances with vinegar is a good practice, as is installing a sediment pre-filter. If aesthetic concerns or appliance longevity are priorities, a water softener could be a worthwhile investment. While the water quality consistently meets EPA standards, minor seasonal shifts in hardness can occur due to rainfall affecting source water dilution.