The Holyoke Water Works (HWW), sometimes referred to as the Holyoke Reservoir System, is a public drinking water utility and municipal service agency of the City of Holyoke, Massachusetts, which provides clean drinking water to that city. Founded in 1872 by an act of Massachusetts General Court, the system was developed as a series of reservoirs to serve the growing city's residents and industry at the end of the 19th century. Today its two primary drinking water sources are the Tighe-Carmody Reservoir in Southampton, Massachusetts and McLean Reservoir in Holyoke. While it maintains reserve drinking water supplies at the Ashley and the Whiting Street Reservoirs.