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East of Hudson Municipal Separate Storm Sewer System

Our East of Hudson (EOH) Watershed has a Municipal Separate Storm Sewer System (MS4) regulated by the New York State Department of Environmental Conservation (DEC). As a regulated MS4, the EOH Watershed is required to comply with the Phase II Storm Water Management Plan.

MS4 Annual Report

MS4 Interim Report

MS4 Notice of Intent

Programs and Practice Measures

The Phase II Stormwater regulations require the EOH Watershed to implement programs and practices to control stormwater runoff that may be polluted.

Stormwater from a rain event or melting snow can pick up and move sediment and a variety of pollutants. Because the stormwater transports whatever is left on our lawns and roads, individual actions make a difference in determining the kinds and amounts of pollution.

In the EOH Watershed, the main pollutant of concern is phosphorus. You can learn more about pollution prevention practices by visiting the DEC website.

If you observe illegal dumping or discharges into any storm sewers, please call (914) 232-8642 or (845) 334-7185, or email

Understanding the Phosphorous Issue

Understanding the Phosphorous Issue
Introduction of phosphorous into freshwater systems often leads to eutrophication, which is a condition where high nutrient levels lead to excessive production of algae and macrophytes in aquatic systems.
Learn more
An Informative Guide on Phosphorus

Stormwater Management Programs

Stormwater Management Programs in the Watershed
Given that New York City’s Watershed Regulations require strict management of stormwater, DEP works with local partners to implement a variety of stormwater management programs that assist businesses and communities with meeting enhanced regulatory requirements.
Learn more

Reservoir Levels

Current: %

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