East Brunswick Water Hardness & Quality Report (2026)

East Brunswick, New Jersey, in Middlesex County — a major New Jersey suburban township known as one of New Jersey's prototypical post-World War II suburban communities (master-planned along Route 18), with significant South Asian-American, Indian-American, and Korean-American communities, and one of New Jersey's largest townships — draws its municipal water supply from the Potomac–Raritan–Magothy (PRM) Aquifer via the East Brunswick Township Water Division and New Jersey American Water. Water hardness in East Brunswick measures 147 mg/L — classified as moderately hard.

East Brunswick's moderate hardness reflects the Middlesex County Coastal Plain's Cretaceous aquifer characteristics. The PRM Aquifer at East Brunswick consists of: the Cretaceous Magothy Formation (calcareous-cemented coarse sand of the New Jersey Coastal Plain — moderately calcareous groundwater from the Magothy sand matrix and calcareous cement); the Cretaceous Raritan Formation (calcareous-moderate marine sand — contributing dissolved calcium); and deeper Potomac Formation sand. The East Brunswick PRM zone's moderate calcareous Cretaceous Coastal Plain aquifer produces the moderate 147 mg/L at household taps.

At 147 mg/L, East Brunswick residents encounter moderate scale accumulation. Faucet aerators and showerheads develop deposits after several months — monthly cleaning with citric acid solution is practical maintenance. East Brunswick Township Water Division consistently delivers water meeting all New Jersey DEP and EPA Safe Drinking Water Act requirements.