Glen Rock Water Hardness & Quality Report (2026)

The Glen Rock Water Utility supplies about 12,000 residents in Bergen County, New Jersey. Their water primarily comes from the Wanaque Reservoir system, managed by the North Jersey District Water Supply Commission. This supply is supplemented by Passaic River intakes and local wells that tap into the Potomac-Raritan-Magothy aquifer. Water is treated at facilities such as the Little Falls plant before being distributed locally. The utility oversees operations within the Upper Passaic River watershed, which includes the Watchung Mountains and the Piedmont physiographic province.

The region's geology features Triassic Lockatong and Passaic Formations—composed of mudstone, siltstone, and sandstone—covered by glacial till. Groundwater from the Brunswick Group aquifers interacts with dolomitic limestones, leaching minerals and contributing to hard water. Surface water from the reservoir also reflects the basin's geology, characterized by moderately mineralized to hard water influenced by carbonate hydrology. This hardness is typical for the area's bedrock composition and mineral dissolution over time.

This very hard water can lead to significant scale buildup in appliances like dishwashers, washing machines, and water heaters, potentially reducing their efficiency and lifespan by 30-50%. You might notice frequent clogging of faucet aerators and showerheads, stiffer laundry, and drier skin. Homeowners often find monthly vinegar descaling of fixtures and annual flushing of water heaters necessary. Installing a whole-house water softener is strongly recommended to prevent appliance damage and improve soap lathering. While the water meets EPA standards with a pH between 7.2-7.8, occasional manganese staining from reservoir turnover is addressed by flushing. The utility also manages corrosion control to keep lead levels below action limits and reports no recent PFAS exceedances.