2004 Connecticut Stormwater Quality Manual

The Department of Energy and Environmental Protection and the Connecticut Council on Soil and Water Conservation have collaborated to prepare the draft updates for the Connecticut Guidelines for Soil Erosion and Sediment Control and the Connecticut Stormwater Quality Manual. We appreciate all the feedback and expertise shared during the public comment period. We will be sharing a more detailed update and the response to comments in the near future. These updates will be posted to draft's webpage and shared with the Water Quality List Serve. 
The Connecticut Stormwater Quality Manual provides guidance on the measures necessary to protect the waters of the State of Connecticut from the adverse impacts of post-construction stormwater runoff. This manual focuses on site planning, source control, and stormwater treatment practices and is intended for use as a planning tool and design guidance document by the regulated and regulatory communities involved in stormwater quality management.

Errata Sheet for the Connecticut Stormwater Quality Manual

The manual can be viewed in two ways: The complete manual or individual chapters.

Stormwater Quality Worksheet (Word) (PDF)

This worksheet is to be used in conjunction with the Connecticut Stormwater Quality Manual for any new land development. It is designed to help the regulated community and regulatory agencies work through the recommendations provided in the 2004 Connecticut Stormwater Quality Manual. It is not currently required to be submitted with any permit applications submitted to the Connecticut Department of Energy and Environmental Protection (DEEP).

Stormwater Quality Manual - View Complete Stormwater Manual 

Stormwater Quality Manual - View By Chapter

Table of Contents (PDF)

• Chapter 1 - Introduction (PDF)

• Chapter 2 - Why Stormwater Matters:  The Impacts of Urbanization (PDF)

• Chapter 3 - Preventing and Mitigating Stormwater Impacts (PDF)

• Chapter 4 - Site Planning and Design (PDF)

• Chapter 5 - Source Control Practices and Pollution Prevention (PDF)

• Chapter 6 - Introduction to Stormwater Treatment Practices (PDF)

• Chapter 7 - Hydrologic Sizing Criteria for Stormwater Treatment Practices (PDF)

• Chapter 8 - Selection Criteria for Stormwater Treatment Practices (PDF)

• Chapter 9 - Developing a Site Stormwater Management Plan (PDF)

• Chapter 10 - Stormwater Retrofits (PDF)

• Chapter 11 - Stormwater Treatment Practice Design Guidance Introduction (PDF)

  • Primary (P) Treatment Practices

    • Stormwater Ponds (PDF)

    • Stormwater Wetlands (PDF)

    • Infiltration Practices (PDF)

    • Filtering Practices (PDF)

    • Water Quality Swales (PDF)

  • Secondary (S) Treatment Practices - Conventional Practices

    • Dry Detention Ponds (PDF)

    • Underground Detention Facilities (PDF)

    • Deep Sump Catch Basins (PDF)

    • Oil/Particle Separators (PD)

    • Dry Wells (PDF)

    • Permeable Pavement (PDF)

    • Vegetated Filter Strips/Level Spreaders (PDF)

    • Grass Drainage Channels (PDF)

  • Secondary (S) Treatment Practices - Innovative/Emerging Technologies

    • Catch Basin Inserts (PDF)

    • Hydrodynamic Separators (PDF)

    • Media Filters (PDF)

    • Underground Infiltration Systems (PDF)

    • Alum Injection (PDF)

• Appendix A - Plant List (PDF)

• Appendix B - Water Quality Flow and Flow Diversion Guidance (PDF)

• Appendix C - Model Ordinances (PDF)

• Appendix D - Site Stormwater Management Plan Checklist (PDF)

• Appendix E - Maintenance Inspection Checklist (PDF)

• Appendix F - Glossary (PDF)

• Low Impact Development (LID) Appendices and Incorporation of LID Principles

Stormwater Index

Content Last Updated June 22, 2023