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PUBLIC NOTICE

New_York_City_Environmental Protection-01

New York City Department of Environmental Protection

PUBLIC NOTICE

IMPORTANT INFORMATION ABOUT YOUR DRINKING WATER

On October 29,2012, the turbidity of the New York City Catskill-Delaware Water Supply at the Kensico Reservoir in Valhalla, New York in Westchester County exceeded 5 nephelometric turbidity units (NTUs) at approximately 6:30 PM. The turbidity returned to below 5 NTU at approximately 8:15 PM. The highest recorded turbidity value was 11 NTU.

Turbidity is a measure of water clarity related to the amount of suspended matter present in the water. The elevated turbidity was a direct result of the high winds that struck as Hurricane Sandy hit the region. The wind was sufficiently intense to cause large waves within Kensico Reservoir, churning up shoreline sediment in the vicinity of the point where water leaves the reservoir and enters the Delaware Aqueduct to the City,  DEP acted quickly and placed the Delaware Aqueduct on by-pass, which avoids using water from the Kensico Reservoir and provides an alternative source of water to the Delaware Aqueduct. However, some turbid water did enter the Delaware Aqueduct before the by-pass operation could be completed. As a precaution, chlorine treatment was increased during this time to enhance the disinfection of the water. Additionally, before being sent into distribution, the water was also treated with UV light, which provides a secondary level of disinfection against potentially harmful microbiological contaminants such as Cryptosporidium and Giardia.

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