Published Water Quality Monitoring and Assessment Reports
Biological Assessment Reports
Groundwater Study Reports and Data
The links below go to United States Geological Survey (USGS) web pages. DEC partners with the USGS to conduct research and publish reports and data for groundwater resources of the state. An overview of the monitoring project for the entire state, including links to methods, maps, and publications, can be found on USGS's 305(b) Ambient Groundwater Quality Monitoring webpage.
- Published Reports:
- Ground-Water Quality in the Delaware River Basin, New York, 2001 and 2005-2006 - Summary and link to full report.
- Groundwater Quality in the Delaware and St. Lawrence River Basins, New York, 2010 - Summary and link to full report.
- Data for the Delaware River Basin can be accessed by:
- Using an interactive map of sample sites listed by sample site number
- Searching a table of sample sites, or
- Downloading the entire groundwater dataset (Note: you will need to save the web page as a text file (.txt) to import into a spreadsheet)
Watershed Management Plans
Third Brook Watershed Management Plan
Facts about this Watershed
The Delaware River Watershed (12,800 square miles) covers parts of New York, Pennsylvania, New Jersey and Delaware. About one-fifth of the upper watershed lies within New York State. These headwaters originate in the Catskill Mountains and eventually flow into Delaware Bay and the Atlantic Ocean. The Delaware River (and a portion of the West Branch) serve as the border between New York and Pennsylvania.
Location: Southeastern New York State
- Most of Sullivan and Delaware Counties,
- Portions of western Orange and Ulster and eastern Broome Counties, and
- Small parts of Greene, Schoharie and Chenango Counties.
Size: 2,390 square miles of land area within New York State
Rivers and Streams: 4,062 miles of freshwater rivers and streams. Major tributary watersheds to the 79 miles of the Delaware River in New York State:
- East Branch Delaware River (1,285 river/stream miles)
- West Branch Delaware River (981 miles)
- Neversink River (626 miles)
- Mongaup River (344 miles)
Lakes, Ponds and Reservoirs: 188 significant freshwater lakes, ponds, and reservoirs (24,932 acres):
- Pepacton Reservoir (5,185 lake/reservoir acres)
- Cannonsville Reservoir (4,605 acres)
- Neversink Reservoir (1,469 acres)