Water

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• Long Island Sound Water Quality and Hypoxia Monitoring Program Overview

  The CT DEEP Water Monitoring Program, on behalf of the Long Island Sound Study estuary program, performs an intensive year-round water quality monitoring program on Long Island Sound. The data collected are used to understand the current conditions and changes in the water quality of the Sound.

• Hypoxia Maps - Summer 2025

• Connecticut Water Quality Standards 2011 Revisions

• Archive of Water Quality Standards Documents

  This archive contains copies of Water Quality Standards which were previously adopted in Connecticut.

• Training for Inland Wetlands Agencies

  Municipal Inland Wetlands Agency Comprehensive Training Program

• Inland Wetlands and Watercourse Status and Trends

  Inland Wetlands and Watercourses Status and Trends

• Nonpoint Source Management Grant Program

  This page is about the CT 319 NPS funds

• Triennial Review of the Connecticut Water Quality Standards

  Topics under Consideration for Revision within the WQS Regulations 2025

• PFAS Surface Water and Fish Tissue Monitoring

  Information on DEEP efforts to monitor PFAS in surface waters and fish tissue.