The Newburgh area was first settled in the early 18th century by the Germans and British. During the American Revolution, Newburgh served as the headquarters of the Continental Army. Prior to its chartering in 1865, the city of Newburgh was part of the town of Newburgh; the town now borders the city to the north and west. East of the city is the Hudson River; the city of Beacon, New York is across the river and it is connected to Newburgh via the Newburgh–Beacon Bridge. The entire southern boundary of the city is with the town of New Windsor. Most of this boundary is formed by Quassaick Creek. In May 2016, the city requested help for its PFOS contaminated water supply under Superfund.