Editing Delaware River (section)

===New York City water supply===
{{further|New York City water supply system}}

After [[New York City]] built 15 reservoirs to supply water to the city's growing population, it was unable to obtain permission to build an additional five reservoirs along the Delaware River's tributaries. As a result, in 1928 the city proposed to draw water from the Delaware River, putting them in direct conflict with villages and towns across the river in [[Pennsylvania]] which were already using the Delaware for their water supply. Additionally, the [[Government of New Jersey]] raised concerns that New York's water diversions might hinder New Jersey's future development of dams and [[hydropower]]; that the [[water quality]] of the river would be impacted, due to reduced flows of fresh water; and that its [[Riparian water rights|riparian rights]] would be diminished. New Jersey filed suit against New York State and New York City, with the [[Government of Pennsylvania]] intervening in the case to protect its interests. In 1931 the [[U.S. Supreme Court]] decided that New York could draw water from the Delaware tributaries, subject to the laws of [[United States Congress|Congress]] and regulation by the [[United States Army Corps of Engineers|US Army Corps of Engineers]].<ref>United States Supreme Court. ''New Jersey v. New York,'' {{ussc|283|36|1931|el=no}}</ref> New York City was allowed to draw {{convert|440|e6USgal|m3}} of water a day from the Delaware and its upstream tributaries.{{Citation needed|date=March 2025}}