Ewing Water Hardness & Quality Report (2026)

Ewing, New Jersey, in Mercer County — a major central New Jersey Mercer County community adjacent to Trenton (Ewing is directly west of Trenton — the New Jersey state capital — and north of Lawrence Township in the Delaware River corridor), home of The College of New Jersey (one of New Jersey's top public liberal arts universities, originally known as Trenton State College), a diverse Mercer County community with a significant African-American, Indian-American, and Korean-American population, and a major Trenton-area suburban community in the Philadelphia–New York I-95 corridor — draws its municipal water supply from the Delaware River system via New Jersey American Water. Water hardness in Ewing measures 167.5 mg/L — classified as hard.

Ewing's moderate hardness reflects the central New Jersey Newark Basin and Delaware River watershed geology and NJAW distribution characteristics. The Delaware River at Ewing–Mercer County carries: the Triassic Newark Basin red shale and sandstone (calcareous-moderate Triassic rift basin sediments); the Precambrian Highlands and Piedmont (calcareous-moderate) drainage from the upper Delaware watershed; and the Delaware River alluvial deposits. NJAW distribution to the Ewing–Mercer County zone produces the moderately hard 167.5 mg/L.

At 167.5 mg/L, Ewing residents encounter moderately hard scale accumulation. Monthly cleaning with citric acid solution is recommended. NJAW consistently delivers water meeting all New Jersey DEP and EPA Safe Drinking Water Act requirements.