NYC DEPT. OF ENVIRONMENTAL PROTECTION--AQUATIC ALGAECIDE APPLICATION AT NEW CROTON, MUSCOOT, CROSS RIVER, AND CROTON FALLS RESERVOIRS

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Bureau of Water Supply
Natural Resources Division

Aquatic Algaecide Application at New Croton, Muscoot, Cross River, and Croton Falls Reservoirs

Dear Anglers-

We want to inform you about an upcoming project for targeted applications of an algaecide treatment to reservoirs within the Croton System. As in previous years, applications may occur on parts of the New Croton, Muscoot, Cross River, and Croton Falls reservoirs between May and August 2024. Such applications are a common practice used in water supply systems to treat algae.

Starting next week, May 22nd, you may notice DEP boats going back and forth across some parts of the reservoirs to apply the treatment. The algaecide (copper sulfate pentahydrate) used is not harmful to humans once dissolved in water and will not have any effects on water quality.

This year, we will continue to treat hydrilla in the New Croton Reservoir by using fluridone, the safest and most effective option for removing this invasive weed. DEP has obtained state and local permits for this treatment. During the summer and early fall, anglers should expect to see additional boats on the reservoir when the treatment is being applied.

We continue to work with the NYS Department of Environmental Conservation (DEC) to obtain all necessary permits for this important work. These projects will not affect the fish consumption advice provided by the NYS Department of Health (DOH).

We appreciate your patience and understanding as we work to further protect our reservoirs. If you have any questions, please email us at recreation@dep.nyc.gov.