Stormwater Management Plan

The Connecticut Department of Energy and Environmental Protection issued an updated "General Permit for the Discharge of Storm water from Small Municipal Separate Storm Sewer Systems" (MS4 Permit) which took effect on July 1, 2017. This permit regulates the discharge of storm water from all of the Town-owned and maintained drainage systems, and includes many new requirements related to such items as illicit discharge detection and elimination, water quality treatment for private developments that discharge into the town system, and increased inspection and maintenance requirements for public and private storm water infrastructure. A fact sheet describing the updated permit can be found here: CT DEEP Fact Sheet

The Towns plan for compliance with this new permit is now available for review via this link:

 2017 Stormwater Management Plan

(The prior version of the stormwater management plan issued in 2004 can still be found here).

This plan includes six minimum control measures as required by the DEEP MS4 Permit including:

1. Public Education and Outreach
2. Public Participation
3. Illicit Discharge Detection and Elimination
4. Construction Site Run-off Control
5. Post-Construction Stormwater Management
6. Pollution Prevention / Good Housekeeping

Annual Reports

Also required under the DEEP MS4 General Permit is the requirement for the publishing of annual reports regarding progress toward the goals set in the Stormwater Management Plan. The annual reports from past/recent years can be found below. Prior annual reports and testing can be found here.

• 2023 Annual Report
• 2022 Annual Report
• 2021 Annual Report
• 2020 Annual Report
• 2019 Annual Report
• 2018 Annual Report

Illicit Discharge Detection and Elimination (IDDE) Program

The DEEP MS4 General Permit also requires that the Town develop and implement a plan for the detection and elimination of illicit discharges to the town storm drainage system. These may include continuous discharges such as cross connections of sanitary sewer pipes, as well as point source discharges such as septic system failures or sanitary sewer overflows. The Town IDDE Program can be found using the link below.

 IDDE Program 7-1-2018

Outfall Mapping

The DEEP MS4 General Permit also requires that the Town map all storm drain outfalls of 15" and greater, and to identify certain characteristics of each outfall. Interconnection points of the Town drainage systems with those of other MS4s (such as ConnDOT) also must be mapped under this permit. The Town's mapping can found in our GIS system using the following link:  GIS Outfall and Interconnection Mapping

Stormwater Pollution Prevention

Click here to learn more about the Town's educational initiatives to prevent stormwater pollution in the Glastonbury community.

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