Water

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• Norwalk River Dam No. 2 Rehabilitation

  Norwalk River Dam Rehabilitation Project

• State Dams and Dam Safety

• Introduction to Dams

  Dams in the Connecticut

• Total Maximum Daily Load

  The Connecticut TMDL Program works to develop water quality plans for protection and restoration.

• Aquatic Life Impacts of Phosphorus Research

  The CT DEEP Monitoring Group is engaged in several efforts to study the effects of phosphorus in water bodies. This webpage provides information on the monitoring efforts, results and analysis conducted by the Monitoring Program. These efforts include recommendations by the Connecticut Academy of Science and Engineering report ‘Methods to Measure Phosphorus and Make Future Projections’ developed as part of Public Act 12-155, An Act Concerning Phosphorus Reductions in State Waters.

• 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.

• Stormwater Planning Tool for Impervious Cover

  Stormwater planning tool: Impervious Cover (IC Response Plan) provides details on the local watershed conditions, impervious cover, and implementation measures.

• Connecticut's Water Resources

  Connecticut's Water Resources include ground water, lakes & ponds, coastal/Long Island Sound, rivers & streams and wetlands

• Long Island Sound Water Quality Monitoring FAQs

  Answers to commonly asked questions about the Long Island Sound Water Quality Monitoring Program.

• Water Quality (305b) Report to Congress

  The DEEP Water Monitoring Group conducts annual water quality monitoring to evaluate the physical, chemical and biological condition of the State’s waters. Group staff collect a wide variety and large quantity of information each year, including water chemistry data, water temperature data, bacteria data, biological community data (fish, macroinvertebrates, diatoms) and tissue contaminant data.

• Water Conservation Guidance for Homeowners with Wells

  Water conservation guidance for homeowners with wells

• Tips for Conserving Water

  Tips for Conserving Water

• Water Diversion Program - Background

  The Registration of water diversions occurred in 1982 and 1983. It was required by the Water Diversion Policy Act, in section 22a-368 of the Connecticut General Statutes.

• Triennial Review of the Connecticut Water Quality Standards

  Topics under Consideration for Revision within the WQS Regulations 2025

• Request for Proposals for Nonpoint Source Management Grant Program

  This is the request for proposals for CT 319 NPS funds