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Reservoir Levels
Check the latest reservoir levels, consumption data and overall watershed precipitation.
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Drinking Water Supply and
Quality Report
The Drinking Water Supply and Quality Report provides basic information about the New York City Water Supply - including program highlights and summary water quality data.
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2008 Watershed Water Quality
Annual Report
This report provides summary information about the watersheds,
streams, and reservoirs that are the sources of the City’s
drinking water.
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Groundwater System
Information about the groundwater system in southeast Queens, including treatment and operational information, and water quality data.
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2008 Filtration Avoidance Annual Report
For the period January 1 through December 31. Prepared in accordance with the July 2007 Filtration Avoidance Determination.
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Cryptosporidium and Giardia Background Information and Monitoring Program
The City's conducts routine and enhanced monitoring for the protozoa Giardia and Cryptosporidium in the watershed.
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Waterborne Disease Risk Assessment Program (WDRAP)
WDRAP is a joint program of the Departments of Environmental Protection and Health to study gastrointestinal illnesses, including giardiasis and cryptosporidiosis, and to conduct epidemiological assessments.
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Maps of New York City's Water Supply System
A map of the New York City Water Supply System, and individual maps of the Catskill/Delware and Croton Watersheds.
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Sampling Stations
Water quality sampling stations enhance DEP's water quality monitoring program.
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History of New York City's Water Supply System
The New York City water supply systems dates back to 1677.
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Drought and Water Consumption
A brief history of drought and water consumption in the New York City Water Supply System.
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Watershed Protection
nyc.gov/watershed is special website devoted to the New York City Water Supply System's upstate watersheds. It covers how DEP is improving water-related infrastructure, managing land and water resources, and working with partners in the watershed areas to protect this vital resource.
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What Makes the Big Apple Grow: Historic Photographs of the New York City Water Supply System
Every day, over a billion gallons of water flow from upstate reservoirs to New York City's homes and businesses. Massive engineering projects, built over two centuries, capture water in 19 upstate reservoirs. Tunnels, and aqueducts, constructed deep underground, deliver an endless supply of this precious commodity to our city. This collection of photographs from DEP's archives traces some of the history of this magnificent water supply system.
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