Parsippany Water Hardness & Quality Report (2026)

The Township of Parsippany-Troy Hills Water Department serves the community from 19 active groundwater wells located within the township. The primary source is the Glacial sand and gravel aquifer. Emergency interconnections exist with the Town of Boonton, Township of Denville, and Borough of Mountain Lakes. Additional purchased surface water is acquired from the Jersey City Municipal Utilities Authority via the Jersey City Reservoir, though groundwater predominates. The department monitors physical, chemical, and other parameters to maintain water quality throughout the distribution system.

The supply draws from northern New Jersey's glacial deposits overlying limestone and dolomite bedrock formations of ancient origin. These carbonate-rich layers characterize the geology — percolating groundwater acquires elevated levels of dissolved minerals as it moves through mineral-rich strata, leading to naturally high concentrations of calcium and magnesium. Deep aquifer passage through these mineralized rocks shapes the water's chemistry without surface runoff influences, resulting in a hard supply character typical of the region.

Very hard water promotes significant scale buildup in pipes, water heaters, and appliances, reducing water heater efficiency by up to 29% within two years and shortening lifespan from 12–15 to 6–8 years. Dishwashers, washing machines, and fixtures are also affected, increasing energy costs and detergent use. Regular vinegar descaling helps, but a whole-house water softener is strongly recommended to remove calcium and magnesium, protect systems, and reduce ongoing expenses. Monitoring data notes 7 contaminants above EPA health guidelines including chromium-6; PFAS monitoring shows no compounds above 2024 EPA guidelines. The utility affirms no current EPA MCL violations.