MS4 Resources

The new General Permit for the Discharge of Stormwater from Small Municipal Separate Storm Sewer Systems (MS4 General Permit) goes into effect July 1, 2017. The permit requires municipalities to take steps in addressing the discharge of pollutants into local waterbodies. All fifteen of SCRCOG’s member municipalities are required to register for the permit and be compliant with the permit’s six Minimum Control Measures. Below is a list of resources available to aid communities in reaching compliance.


The CT Department of Energy and Environmental Protection (CT DEEP) adminsters the MS4 General Permit program.

MS4 General Permit (Effective 7/1/17)
Best Management Practice (BMP) Timeline
Other Municipal Stormwater Information


Through funding from CT DEEP, CT NEMO is developing resources to assist municipalities with meeting the MS4 program requirements.  These resources include templates for the Stormwater Management Plan and Annual Reports, mapping of impervious cover, outfall monitoring assistance, draft regulations and ordinances, and educational webinars.

Additionally, CT NEMO completed a regulatory assessment of the barriers to implementing low impact development (LID).  CT Nemo created a storymap to help explain the project.