Westfield Water Hardness & Quality Report (2026)

Westfield, Massachusetts, in Hampden County in the Westfield River valley — the 'Whip City' (Westfield was the largest buggy whip manufacturing center in the world in the 19th century — at peak production, over 75% of all horse whips in the US were made in Westfield), home of Westfield State University, a major Greater Springfield area manufacturing and education community, and a Hampden County Connecticut River Valley city — draws its municipal water supply from Cobble Mountain Reservoir on the Little River via the City of Westfield Water Division. Water hardness in Westfield measures 85.5 mg/L — classified as moderately soft.

Westfield's moderate softness reflects the western Massachusetts reservoir watershed's mixed geology. The Cobble Mountain Reservoir watershed drains: the Westfield Highlands (Precambrian–Ordovician calcareous-poor Berkshire gneiss and schist — the western Massachusetts crystalline uplands, calcareous-poor); and the Jurassic Hartford Basin fringe (the New Haven Arkose and East Berlin Formation — moderately calcareous Connecticut Valley Mesozoic arkosic sedimentary terrain). The blend of calcareous-poor Berkshire crystalline upland and some moderately calcareous Hartford Basin sediment produces the moderate 85.5 mg/L.

With hardness at 85.5 mg/L, Westfield residents enjoy moderately soft water. City of Westfield Water Division consistently delivers water meeting all Massachusetts MassDEP and EPA Safe Drinking Water Act requirements.