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Data Series 497

Prepared in cooperation with the
New York City Department of Environmental Protection

U.S. Geological Survey Catskill/Delaware Water-Quality Network: Water-Quality Report Water Year 2006

By Michael R. McHale and Jason Siemion


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The U.S. Geological Survey operates a 60-station streamgaging network in the New York City Catskill/Delaware Water Supply System. Water-quality samples were collected at 13 of the stations in the Catskill/Delaware streamgaging network to provide resource managers with water-quality and water-quantity data from the water-supply system that supplies about 85 percent of the water needed by the more than 9 million residents of New York City. This report summarizes water-quality data collected at those 13 stations plus one additional station operated as a part of the U.S. Environmental Protection Agency’s Regional Long-Term Monitoring Network for the 2006 water year (October 1, 2005 to September 30, 2006). An average of 62 water-quality samples were collected at each station during the 2006 water year, including grab samples collected every other week and storm samples collected with automated samplers. On average, 8 storms were sampled at each station during the 2006 water year. The 2006 calendar year was the second warmest on record and the summer of 2006 was the wettest on record for the northeastern United States. A large storm on June 26–28, 2006, caused extensive flooding in the western part of the network where record peak flows were measured at several watersheds.

First posted April 30, 2010

For additional information contact:
U.S. Geological Survey
New York Water Science Center
425 Jordan Road
Troy, NY 12180

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

McHale, M.R., and Siemion, Jason, 2010, U.S. Geological Survey Catskill/Delaware water-quality network: Water-quality report water year 2006: U.S. Geological Survey Data Series 497, 36 p., at




Network Description

Schoharie Watershed

Ashokan Watershed

Cannonsville Watershed

Pepacton Watershed

Neversink Watershed

Rondout Watershed

Climate Summary


Field Methods

Laboratory Methods

Statistical Methods

Water-Quality Station Summary

References Cited

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