Established more than 100 years ago in 1922, the Locust Valley Water District and its staff have pledged to provide consumers with an ample supply of water for domestic use and emergency firefighting purposes. With six deep wells and more than 60 miles of water mains, we deliver high-quality drinking water to a population of 7,500, serving communities including Locust Valley, Lattingtown, and sections of Mill Neck and Matinecock.