Connecticut Department of Energy & Environmental Protection

DOT MS4 GP

Department of Transportation (DOT) Separate Storm Sewer System General Permit

DEEP first issued the General Permit for the Discharge of Stormwater from the Connecticut Department of Transportation Separate Storm Sewer Systems (CTDOT MS4) on May 24, 2018 (effective July 1, 2018) under the EPA Stormwater Rule.

 

2025 Permit Issuance Package

DOT MS4 Stormwater Management Plan (2020)

Please note, this SMP will be updated in 2025 upon receipt from CT DOT.

**DOT MS4 General Permit** (75 pages, uploaded 08/05/2025)

  • Issuance Date: 06/23/2025
  • Effective Date: 07/01/2025
  • Expiration Date: 06/30/2030

Fact Sheet for the DOT MS4 General Permit (21 pages, uploaded 08/05/2025)

Response to Public Comments for the reissuance of the MS4-DOT General Permit (2 pages, uploaded 08/05/2025)

 

For additional details on the permit please contact the Stormwater Permitting, Compliance, & Enforcement Program: DEEP.StormwaterStaff@ct.gov.

 

Please visit CT Department of Transportation’s website for more information: CT DOT MS4

  • Permit application
  • Stormwater Pollution Prevention Plan
  • Annual Report

The cornerstone of the MS4 permit is the Stormwater Pollution Prevent Plan

 

This plan outlines a program of best management practices (BMPs), measurable goals, responsible individuals or departments, and sets forth implementation schedules for the following six minimum control measures specified in the permit:

 

Additionally, the SWMP outlines the Department’s

plan to monitor and improve the quality of stormwater

runoff from DOT’s stormwater system to impaired

surface water bodies. 


 

CT DOT Drainage Network

*Disclaimer: The following information is not generated by CT DEEP.  Please visit the CT DOT website for more information.

This service represents CTDOT’s Stormwater Drainage Network available for the Open Data Portal. The CTDOT Drainage Network for public viewing includes Culverts, Closed Conveyances, Open Conveyances, Virtual Drian Lines, Inlets, Headwalls/End Walls, Manholes, Blind Ties, Interconnections, Other Drainage, and BMP’s.

Website link: https://www.arcgis.com/home/item.html?id=f041d1a6e36643208d67f2452de558a9

 

If you believe that you have observed an illicit discharge entering or leaving CTDOT’s storm sewer system please send an email to DOT.MS4@ct.gov. or call the CTDOT Customer Care Center (860) 594-2560. 

 

 

 

 

 

 

Content last updated August 7, 2025