Naugatuck Water Hardness & Quality Report (2026)

Naugatuck, Connecticut, in New Haven County — a major west Connecticut Naugatuck Valley industrial borough (Naugatuck is one of the most historically significant industrial communities in Connecticut — a Naugatuck Valley borough with a major rubber and vulcanization manufacturing heritage; the Naugatuck Valley was one of the most important rubber manufacturing corridors in the United States in the 19th and early 20th centuries — 'the rubber capital of the United States'; the Uniroyal plant in Naugatuck was a major employer for generations), a diverse New Haven County community with a significant Portuguese-American, Polish-American, Italian-American, and working-class heritage (Naugatuck's ethnic Catholic immigrant community heritage is one of the defining characteristics of the Naugatuck Valley corridor), home of the Naugatuck Historic District (a significant collection of industrial era civic buildings), and a Naugatuck River valley community — draws its municipal water supply from the Naugatuck River via the Borough of Naugatuck Water Division. Water hardness in Naugatuck measures 77 mg/L — classified as moderately soft.

Naugatuck's moderate softness reflects the west Connecticut Naugatuck Valley's calcareous-poor New England Appalachian watershed. The Naugatuck River watershed drains the Precambrian Pine Bridge Gneiss and Ordovician Connecticut Valley metasedimentary (calcareous-poor crystalline). Borough of Naugatuck produces the moderately soft 77 mg/L.

With hardness at 77 mg/L, Naugatuck residents enjoy moderately soft water. Borough of Naugatuck Water Division consistently delivers water meeting all Connecticut DEEP and EPA Safe Drinking Water Act requirements.