New York City has been collecting water quality data in New York Harbor since 1909. These data are utilzed by regulators, scientists, educators and citizens to assess impacts, trends and improvements in the water quality of New York Harbor. Today the Harbor Survey Program is managed by the New York City Department of Environmental Protection.
Drinking Water Supply and Quality Reports are prepared annually by the New York City Department of Environmental Protection in accordance with the New York State Sanitary Code and the National Primary Drinking Water Regulations of the United States Environmental Protection Agency, which require all drinking water suppliers to provide the public with an annual statement describing the sources and quality of its water supply.
Watershed Annual Reports provide summary information about the watersheds, streams and reservoirs that are the sources of New York City's drinking water. They provide a general overview of the city's water resources, their condition during the year, and report on the Department of Environmental Protection's compliance with regulatory standards or guidelines. These reports are complementary to the New York City Drinking Water Supply and Quality Reports, also published annually.