Old Bridge Water Hardness & Quality Report (2026)

Old Bridge, New Jersey, in Middlesex County in the central New Jersey suburban corridor near Sayreville and the Raritan Bay shoreline, receives its municipal water from New Jersey American Water, which draws from the Raritan River basin reservoir system — primarily Round Valley Reservoir and Spruce Run Reservoir in Hunterdon County, connected through the New Jersey water supply transfer infrastructure. New Jersey American Water treats and distributes supply through the Middlesex County service area, including Old Bridge's large suburban residential community.

The moderately hard 124 mg/L hardness and TDS of 274.2 mg/L reflect the Raritan basin's characteristic Triassic geological influence. The Raritan River and its tributaries drain the Triassic Newark Basin of central New Jersey — composed of the Brunswick Formation (red sandstone, siltstone, and mudstone with calcareous cement), Lockatong Formation argillites, and associated Newark Supergroup sedimentary rocks. These Triassic rift basin deposits release modest calcium and magnesium carbonate from their calcareous cement and thin interbedded limestone lenses, producing a consistently moderate hardness supply throughout the central New Jersey NJAW service area.

At 124 mg/L, Old Bridge's water is moderately hard — standard for the central New Jersey suburban corridor. Scale forms gradually in kettles and appliances over months, the dishwasher benefits from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling of heating appliances is the appropriate maintenance schedule. The elevated PFAS level of 9.9 ppt is a significant concern for Old Bridge — Middlesex County's industrial corridor, proximity to former US military sites, and the dense manufacturing zone along the Raritan River bayshore contribute to among the higher PFAS levels in the county. A certified reverse osmosis filter for drinking and cooking water is a priority investment.