North Andover Water Hardness & Quality Report (2026)

North Andover, Massachusetts, in Essex County — a major northeast Massachusetts Merrimack Valley suburban community (North Andover is a significant Essex County town — a northeast Massachusetts suburb with one of the most prestigious private schools in New England: Phillips Academy Andover (located in adjacent Andover; often considered the most prestigious private secondary school in the United States — Phillips Academy Andover has more US senators, governors, and presidents among its alumni than any other private secondary school; George H.W. Bush and George W. Bush both attended Phillips Andover); North Andover itself is known as a desirable north of Boston suburban community with its own strong public school system and the Lake Cochichewick reservoir (one of the most attractive watersheds in Essex County)), a diverse Essex County community with a primarily working-class to upper-middle-class, Irish-American, and suburban family population, adjacent to Andover and Methuen in the northeast Essex County Merrimack Valley corridor, and a growing north of Boston suburban community — draws its municipal water supply via the Town of North Andover DPW (Water). Water hardness in North Andover measures 124.5 mg/L — classified as moderately hard.

North Andover's moderate hardness reflects the northeast Massachusetts Essex County Lake Cochichewick watershed's calcareous-poor crystalline geology with distribution variation. The Lake Cochichewick reservoir system drains the Precambrian Andover Granite (calcareous-poor). North Andover Water treatment produces the moderate 124.5 mg/L.

At 124.5 mg/L, North Andover residents encounter moderate scale accumulation. Monthly cleaning is recommended. Town of North Andover DPW consistently delivers water meeting all Massachusetts DEP and EPA Safe Drinking Water Act requirements.