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.

MS4 Listserv

The University of Connecticut hosts an MS4 electronic mailing list to enable communities to stay connected and share resources and best practices.

Consultant Services

Naugatuck Valley COG performed an RFP for general consulting services related to the MS4 program. There are six pre-qualified consultants on the on-call list.

The Capitol Region COG provides bidding opportunities under their Capitol Region Purchasing Council, for both Stormwater Monitoring Services and Catch Basin Cleaning Services.