The General Permit for the Discharge of Stormwater and Dewatering Wastewaters from Construction Activities  ("Construction Stormwater General Permit") requires developers and builders to implement a Stormwater Pollution Control Plan to prevent the movement of sediments off construction sites into nearby water bodies and to address the impacts of stormwater discharges from a project after construction is complete.

Important Update: New Construction Stormwater General Permit Coming January 1, 2026

 

The Water Permitting & Enforcement Division Stormwater Program is in the final stages of reissuing the Construction Stormwater General Permit.  This permit regulates the discharge of stormwater from construction activities to protect Connecticut’s surface waters.

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Temporary Closure of ezFile for New Construction Applications

In order to update the application system for the new permit, the ezFile system for new constructions applications will be temporarily closed as of December 1, 2025.

• Effective December 1, 2025: DEEP will not be able to accept electronic applications or registrations for new coverage until the general permit is reissued and becomes effective on January 1, 2026.
• Please check back for updates and guidance as the effective date approaches.

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What This Means for You

Status	Guidance
Facilities already covered under the current permit	Your coverage will continue during this transition period.
Registrations currently in the system	Deep staff will continue to process complete applications currently in our system. **Important** Registrations found to be insufficient during the time will be returned, and a new submission will be required when the general permit is reissued.
New sites that need coverage	Please reach out to the Stormwater Program by emailing DEEP.StormwaterStaff@ct.gov for next steps

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REISSUANCE OF THE CONSTRUCTION STORMWATER GENERAL PERMIT: NOTES FOR THE 2025 PUBLIC NOTICES OF THE REISSUANCE OF THE CONSTRUCTION STORMWATER GENERAL PERMIT: 06/27/2025 – Notice of Tentative Determination: 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.  06/27/2025 – Fact Sheet: The Fact Sheet explains the permit history and why certain changes are being proposed. DOCUMENTS FROM THE JUNE 2025 PUBLIC NOTICE **Draft Permit** (61 pages, uploaded 06/27/2025) Fact Sheet for the National Pollutant Discharge Elimination System (NPDES) General Permit for the Discharge of Stormwater Associated with Construction Activities and Appendices (26 pages, uploaded 06/27/2025) Notice of Tentative Determination – Intent to Reissue the General Permit for the Discharge of Stormwater Associated with Construction Activities (3 pages, uploaded 06/27/2025) Appendices for the Construction Draft Permit (54 pages, uploaded 08/06/2025)




Construction Stormwater General Permit and Registration Information:

• General Permit for the Discharge of Stormwater and Dewatering Wastewaters from Construction Activities-- effective December 31, 2020; modified November 25, 2022
• Recommended Final Determination with Attachments and Response to Comments
• Fact Sheet
• Modifications Regarding Activities within Cold Water Stream Habitats Fact Sheet
• Fisheries Consultation Form (Word, PDF) for Activities Within 100 Foot Buffer of Cold Water Stream Habitat
• Website Notice of Reissuance
• Impaired Waters Table for Construction Stormwater Discharges
• Coastal Management Determination Form (Appendix D) (Word, PDF) 
• Stormwater Pollution Control Plan Review Checklist  (Word, PDF)
• National Stormwater Calculator EPA’s National Stormwater Calculator is a desktop application that estimates the annual amount of rainwater and frequency of runoff from a specific site based on available information such as soil type, landscape and land-use information, historical weather, and types of low impact development controls)
• Notice of Termination Form--Non-Solar Projects (Word, PDF)
• Notice of Termination Form--Solar Projects (Word, PDF)

Go Paperless with DEEP's ezFile!



https://filings.deep.ct.gov/DEEPPortal/

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 deep.stormwaterstaff@ct.gov.  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 (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 DEEP.StormwaterStaff@ct.gov
• Posting of Registrations for the Construction Stormwater General Permit:
• https://filings.deep.ct.gov/DEEPPortal/PublicSearch/SWC. This link will show registrations received and provide a date by which time citizens can comment on the registrant's Pollution Control Plan.
• To request or comment on a registration or Pollution Control Plan, submit a written request/ comment to DEEP.StormwaterStaff@ct.gov. A request/comment must include your name, contact information, and the project’s Application Number. Registration information will remain posted on this webpage for at least 90 days from the date of registration receipt.
• Stormwater Management

Content Last Updated December 1, 2025