Catskill Turbidity Control Study Client: New York City Department of Environmental Protection Though turbidity in the Catskill System is typically low (<5 NTU), periodic extreme storm events expose naturally occurring silt/clay deposits in stream banks and channels. Elevated turbidity levels in some rare cases require alum treatment at the terminal reservoir to ensure safe drinking water supply and regulatory compliance. As part of an overall program to upgrade New York City’s (NYC) West-of- Hudson water supply facilities, Hazen and Sawyer (in joint venture) conducted a study of alternatives to reduce turbidity in NYC’s unltered 600-mgd Catskill supply system. Project Outcomes and Benefits The Team developed a state-of-the-art, linked water supply- water quality model that allows daily re

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