Department of Environmental Conservation

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NYC Watershed Reservoirs

The NYC Watershed's 19 Reservoirs

What is a Watershed?

A watershed is an area of land that drains into a body of water, such as a river, lake, reservoir, estuary, sea or ocean. The watershed includes the network of rivers, streams and lakes that convey the water, as well as the land surfaces from which water runs off. Watersheds are separated from adjacent watersheds by high points, such as mountains, hills, and ridges. The NYC Watershed's reservoirs provide water to NYC through four supply systems. The reservoirs in each supply system are connected.

  • Catskill Supply System
  • Delaware Supply System
  • Croton Supply System
  • Catskill/Delaware Supply System

Catskill Supply System

  • Ashokan Reservoir
  • Schoharie Reservoir

Delaware Supply System

  • Cannonsville Reservoir
  • Neversink Reservoir
  • Pepacton Reservoir
  • Rondout Reservoir

Croton Supply System

  • Amawalk Reservoir
  • Bog Brook Reservoir
  • Cross River Reservoir
  • Croton Falls Reservoir
  • Diverting Reservoir
  • East Branch Reservoir
  • Middle Branch Reservoir
  • Muscoot Reservoir
  • New Croton Reservoir
  • Titicus Reservoir

Catskill / Delaware Supply System

  • Boyds Corners Reservoir
  • Kensico Reservoir
  • West Branch Reservoir

What You Can do!

Each of us lives in a watershed. On our Watershed Stewardship page are some tips on actions that you and your friends can take to help care for and protect your watershed.

Important On-going Initiatives within the New York City Watershed

  • EOH Municipal Separate Storm Sewer System (MS4) initiative
  • Total Maximum Daily Load (TMDL) Implementation Plan
  • Pharmaceutical Monitoring
  • Funding Opportunities for Water Quality Improvement Projects
    • Summary of Safe Drinking Water Act Projects
    • Summary of Water Resources Development Act Projects

Published Water Quality Monitoring and Assessment Reports