Westchester Joint Water Works (WJWW) is a nonprofit public benefit corporation formed in 1927 with a duty to act in the best interests of the public it serves in providing a reliable source of safe drinking water.

WJWW is composed of three member municipalities: the Village of Mamaroneck, the Town of Mamaroneck, and the Town/Village of Harrison, which formed WJWW for the purpose of operating a combined municipal water works system. ​


Think of WJWW as your local water department.

WJWW supplies water to its member municipalities and to portions of the cities of Rye and New Rochelle, serving 59,629 consumers through 14,682 service connections.

WJWW also provides water on a wholesale basis to the Village of Larchmont and Veolia (formerly Suez Water Westchester), which sells water to the City of Rye, Village of Rye Brook and Village of Port Chester. In all, WJWW provides drinking water to up to 100,000 residents and other consumers in Westchester County.