Industrial Stormwater General Permit

The General Permit for the Discharge of Stormwater Associated with Industrial Activity (“Industrial Stormwater General Permit”) regulates industrial facilities with point source discharges that are engaged in specific activities listed in the permit. To register for this program, these facilities must submit a registration form, and implement a Pollution Prevention Plan (PPP). The PPP must include information about the site, an inventory of exposed materials, a summary of potential pollutants, a description of and schedule for implementation of storm water control methods, storm water monitoring, and site inspection.  


  • NOTES 
    • 06/05/2024 – 2024 Renewal Registrations: Renewal registrations are not required at this time and should not be submitted. The new registration materials and website links will be posted some time in September 2024 for allow permittees to familiarize themselves with the new process. All renewal registrations submitted before October 1, 2024 will be rejected. Any associated fees will not be refunded and will not carry over to the next registration.  

    • 03/27/2024 - Name Change: The general permit issued 10/01/2021 is titled, “General Permit for the Discharge of Stormwater Associated with Industrial Activities” (aka “Industrial Stormwater General Permit”, “2021 IGP”, etc.). The reissued version will be titled, “National Pollutant Discharge Elimination System (NPDES) General Permit for the Discharge of Stormwater Associated with Industrial Activities” (aka “draft IGP”, “2024 IGP”, etc.)

    • 03/27/2024 – Document Information: The Notice of Tentative Determination expresses the intent to reissue the general permit with the changes seen in the Draft Permit, and explains how public comments can be submitted. The Fact Sheet explains the permit history and why certain changes are being proposed.


    Guidance Documents:

    Video Tutorial - Common Compliance Problems with the Industrial General Permit

    Go Paperless with DEEP's ezFile!

     Go Paperless with DEEP's ezFile!

    ezFile Logo

    How to register using ezFile:
    • Set up a User Account (Instructions for creating a new account)
      (Anyone who intends to prepare, review and/or submit a registration electronically within the ezFile portal must create an account.)
    • Create a Subscriber Agreement (SA) electronically in ezFile. (Instructions for creating an SA)
    • Print Subscriber Agreement.
    • Get "wet" signatures on Subscriber Agreement.
    Update: A scanned pdf of the signed subscriber agreement must be emailed to  Maintain the originally-signed agreement in your records to be made available upon DEEP request.
    • Every person that will fill out, edit, review, certify, or submit an electronic filing must be
      identified and assigned a role. (Instructions for Assigning User Roles)
    • Once you have received email approval of your SA, you can login to ezFile and complete a filing.
      Remember: ezFile has been optimized for Google Chrome.
    If a registrant is not capable of submitting electronically, meaning that they do not have access to a computer, or if you have other questions or concerns regarding ezFile, please contact the stormwater group at 860-424-3025 or
    Check the Status of your Registration/Certification
    Stormwater Monitoring Report Forms:
    Use the appropriate form, from the list below, to submit stormwater monitoring data to the department. Refer to Section 5(e) of the general permit with modifications for specific information on monitoring requirements.

    Update: A scanned pdf of the stormwater monitoring report must be emailed to deep.stormwaterstaff@ct.govMaintain the original stormwater monitoring report in your records to be made available upon DEEP request.
    Types of Facilities
    Revision Date 10/17/11
    General (for facilities without sector-specific requirements) Word , PDF
    Sector A - Asphalt Plants Word , PDF
    Sector B - Mines & Quarries and Stone Cutting Word , PDF
    Sector C - Refuse Systems Word , PDF
    Sector D - Auto Salvage Yards Word , PDF
    Sector E - Scrap Recycling Facilities Word , PDF
    Sector F - Steam Electric Power Generation Word , PDF
    Sector G - Transportation and Public Works Facilities
    • (Non-Municipal) Transportation Facilities (SIC Codes 40, 41, 42, 43, 44 - except 4493 and 45) (use the general form)
    Word , PDF
    • Large Airports
    Word , PDF
    • Small Airports
    Word , PDF
    • Federal, State or Municipal Maintenance/Repair/Salt Storage Facilities
    • Bulk Solid De-icing Material Storage Facilities
    • DOT Maintenance and Repair Facilities
    Word , PDF
    Sector H - Marinas, Yacht Clubs, Boat Dealers Word , PDF
    Sector I - Ship & Boat Building and Repair Word , PDF
    Sector J - Small Scale Composting Facilities Word , PDF

    Stormwater Management

    Content Last Updated June 5, 2024