South Old Bridge Water Hardness & Quality Report (2026)

South Old Bridge, New Jersey, in Middlesex County adjacent to Old Bridge in the central New Jersey suburban corridor along the Raritan Bay approach — a suburban Middlesex County community sharing the regional water supply and industrial legacy of the Old Bridge corridor — receives its municipal water from New Jersey American Water (NJAW), drawing from the Raritan River basin reservoir system through Round Valley Reservoir and Spruce Run Reservoir in Hunterdon County. NJAW serves the Middlesex County South service area including both South Old Bridge and adjacent Old Bridge.

The moderately hard 129 mg/L hardness and TDS of 290.8 mg/L reflect the Raritan River basin's Triassic geological character. The Raritan and its tributaries drain the Triassic Newark Basin of central New Jersey — composed of the Brunswick Formation red bed sandstones, siltstones, and mudstones with calcareous cement binding the rock matrix, along with Lockatong Formation argillites and Stockton Formation fluvial sandstones. These Triassic rift basin sedimentary rocks release moderate calcium and magnesium carbonate as the sediment pores and cement matrix gradually dissolve, producing the characteristic moderate hardness shared across the central New Jersey NJAW service territory.

At 129 mg/L, South Old Bridge's water is moderately hard — standard for this part of New Jersey. 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 appropriate. The elevated PFAS level of 10.2 ppt is a significant concern for this community — Middlesex County's industrial history including the Raritan Riverfront manufacturing zone, former chemical plants, and New Jersey Turnpike industrial corridor contribute to among the highest PFAS levels in the central New Jersey dataset. A certified reverse osmosis filter for all drinking water is strongly recommended.