Salem Water Hardness & Quality Report (2026)

Salem, Massachusetts, in Essex County on Salem Harbor — one of the most historically significant cities in New England (the 1692 Salem Witch Trials; Hawthorne's birthplace; a 19th-century maritime commercial powerhouse), a major tourism destination known globally for its witch history, Halloween capital of the United States, home of the Peabody Essex Museum (one of the oldest continuously operating museums in the US), and a rapidly revitalizing creative economy hub — draws its municipal water supply from Lake Tapley and Putnamville Reservoir via the Salem Water Division. Water hardness in Salem measures 87 mg/L — classified as moderately soft.

Salem's moderate softness — harder than some MWRA communities but softer than many New England cities — reflects the Essex County north shore watershed's calcareous-poor coastal geology with some urban infrastructure mineral accumulation. The Salem reservoir watersheds drain: the Essex County uplands (Precambrian–Devonian Salem Gabbro and Beverly Pluton — calcareous-poor crystalline igneous terrain) and the Lynn Volcanic Complex (calcareous-poor felsic and mafic coastal volcanic terrain). Salem's distribution infrastructure — including older 19th and early 20th century Salem waterfront urban mains — contributes some mineral content, producing the moderate 87 mg/L.

With hardness at 87 mg/L, Salem residents enjoy moderately soft water. Salem Water Division consistently delivers water meeting all Massachusetts MassDEP and EPA Safe Drinking Water Act requirements.