Department of Environmental Conservation

D E C banner

NYC MS4 Permit and Forms

Program Overview

The City of New York (NYC) is considered a large MS4 subject to the Phase I Stormwater Permitting requirements specified in the Clean Water Act. This page contains the State Pollutant Discharge Elimination System ("SPDES") permit that authorizes discharges of stormwater from the large municipal separate storm sewer systems ("MS4s") as defined in Title 40 of the Code of Federal Regulations (40CFR 122.26(b)(4)), currently existing within the jurisdictional boundaries of NYC ("urbanized area"), and limited to those MS4 outfalls owned or operated by New York City. The intent of this SPDES permit is to manage urban sources of stormwater runoff to protect overall water quality and improve water quality in impaired waters as part of a comprehensive integrated planning approach that considers non-MS4 sources and planned controls for those sources.

Other information contained on this page is the factsheet and responsive summary that accompany the permit, and all public comment letters that were received on the permit.


This permit was issued on July 31, 2015, and became effective on August 1, 2015.

Fact Sheet

This document describes how the final permit has changed in response to the public notice of the revised draft on March 11, 2015.

Responsiveness Summary

This document includes the Department's response to all comments received during the public comment periods on the draft Municipal Separate Storm Sewer Systems (MS4) of NYC (NY-0287890).

  • PDF Help
  • For help with PDFs on this page, please call 518-402-8111.
  • Contact for this Page
  • Division of Water
    625 Broadway
    Albany, NY 12233-3500

    Send us an email
  • This Page Covers
  • Page applies to Region 2