Fitchburg Water Hardness & Quality Report (2026)

Fitchburg, Massachusetts, in Worcester County — a major north-central Massachusetts manufacturing city, home of Fitchburg State University, a historically diverse immigrant (Finnish, French-Canadian, Irish, Greek, and now Latin American and Southeast Asian) manufacturing community, and the Wachusett Reservoir watershed city — draws its municipal water supply from the Upper Nashua River watershed via the City of Fitchburg Water Division. Water hardness in Fitchburg measures 72.5 mg/L — classified as moderately soft.

Fitchburg's moderate softness reflects the north-central Massachusetts reservoir watershed's calcareous-poor crystalline geology, very similar to neighboring Leominster (68.5 mg/L). The Fitchburg reservoir watersheds (Fitchburg Reservoir and reservoir chain on the upper Nashua River tributaries) drain: the Fitchburg Highlands (Devonian Fitchburg Complex Diorite and Tonalite — calcareous-poor intrusive igneous terrain, the same Plymouth and Leominster plutonic terrain); Precambrian–Ordovician calcareous-poor gneiss of the central Massachusetts crystalline core. The calcareous-poor Fitchburg plutonic complex watershed produces the soft 72.5 mg/L.

With hardness at 72.5 mg/L, Fitchburg residents enjoy moderately soft water. City of Fitchburg Water Division consistently delivers water meeting all Massachusetts MassDEP and EPA Safe Drinking Water Act requirements.