Municipal Separate Storm Sewer System
The New York City Department of Environmental Protection East of Hudson (NYCDEP EOH) Watershed is a Municipal Separate Storm Sewer System (MS4) regulated by the New York State Department of Environmental Conservation (NYSDEC). As a regulated MS4, the NYCDEP EOH is required to comply with its Phase II Storm Water Management Plan.
MS4 Annual Report
The 2014-2015 MS4 Draft Annual Report is now available online.
MS4 Interim Report
The 2016 MS4 Interim Report is now available online.
MS4 Notice of Intent
The MS4 Notice of Intent is now available online.
Programs and Practice Measures
The Phase II Stormwater regulations require NYCDEP EOH to implement programs and practices to control stormwater runoff that may be polluted. These have six minimum measures:
- Public education and outreach
- Public involvement and participation
- Illicit discharge detection and elimination
- Construction site stormwater runoff control
- Post construction stormwater management practices
- Pollution prevention and good housekeeping
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 also learn more about pollution prevention practices by visiting the NYSDEC website at www.dec.ny.gov.
The NYCDEP EOH has established a stormwater hotline so that any illegal dumping or discharges to any storm sewers can be reported by calling (914) 232-8642 and (914) 232-8790, or by email MS4info@dep.nyc.gov.