Municipal Separate Storm Sewer System

Industrial & Commercial Stormwater Program

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The New York State Department of Environmental Conservation (DEC) requires certain industrial facilities to obtain a Multi-Sector General Permit (MSGP) for stormwater discharge from industrial activities (GP-0-17-004) as part of the State Pollution Discharge Elimination System (SPDES) Permit Program. Although DEC administers the MSGP, the New York City Department of Environmental Protection (DEP) implements an Industrial and Commercial (I/C) Stormwater Program in the municipal separate storm sewer system (MS4) area of New York City. Through the I/C Program, DEP inspects MSGP facilities and takes enforcement actions if necessary. DEP also assesses unpermitted facilities to determine if their stormwater contributions fall under the SPDES Permit Program.

For general information, visit Stormwater Management.

MSGP File Uploader

For active permitted facilities in the MS4 area of New York City, you must send your submittals to DEC and provide copies to DEP.

MSGP File Uploader

To submit your copies to DEP, you must use the MSGP File Uploader. Download the MSGP File Uploader Instructions to learn how to submit your files.

I/C Program Resources

Unpermitted I/C facility owners and operators can find out if DEP plans to assess their facility by contacting ms4@dep.nyc.gov. For more information:

If you have a complaint that relates to industrial activities (stormwater runoff and pollution, air quality, noise, odor, waste management, toxins and hazards), please contact 311 or visit nyc.gov/311.