Water

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  • Stormwater and Water Quality

    Stormwater and its effects on water quality.

  • Ambient Benthic Macroinvertebrate Monitoring

    The DEEP Water Monitoring Group has used benthic macroinvertebrate communities to help characterize stream and river water quality since the mid-1970s. Benthic macroinvertebrates are animals without backbones, who inhabit the bottom of rivers and streams, as well as many other waterbody types. These organisms are very well studied and have a long history of use as indicators of water quality. Certain types, including mayflies, stoneflies, and caddisflies, can survive only in the cleanest water quality conditions. Other major groups of macroinvertebrates are true flies, beetles, worms, crustaceans, and dragonflies.

  • 2013 Proposed Water Quality Standards Regulations

    Previous (2013) proposed changes to the Connecticut Water Quality Standards.

  • State Owned Dams and Flood Control Systems

    DEEP Engineering Services for State Owned Dams

  • Inland Wetlands and Watercourses Resources and References

    Resources and References for Inland Wetlands & Watercourses

  • Connecticut Healthy Waters Initiative

    For several decades, the DEEP Monitoring Group has been building multidisciplinary datasets that include water chemistry data, physical habitat assessments, and biological information. The primary purpose for these data is to support water quality assessments. In addition, through multiple partnerships, the Monitoring Group is using these data to improve our understanding of healthy waters in Connecticut

  • Water Quality Reclassification

    Information regarding a request to change the surface or ground water quality classification of a property or area

  • Water Diversion Program

    Connecticut Water Diversion Program Information and Reporting Forms

  • Cyanobacteria Blooms

    Cyanobacteria, also known as blue-green algae, occur naturally in lakes and ponds throughout Connecticut.  These microscopic organisms often go unnoticed and cause no harm.  However, excessive nutrient pollution and climate change are causing waterbodies to experience more frequent nuisance cyanobacteria blooms that may produce and release toxins.  When cyanobacteria blooms release toxins, people and animals using the water body for recreation can have health effects.  It is important to note that not all algal blooms are harmful algae blooms (HABs), however it is not possible to determine the level of toxins in the water without a more detailed evaluation. Out of precaution it is best to avoid direct contact with water experiencing a bloom.  When in doubt, stay out!   

  • Dam Safety

  • Emergency Action Plans

  • Cold Water Stream Habitat Map

    Cold Water Stream Habitat Map

  • 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.

  • Dam Permitting

  • 2019 CT Volunteer Water Monitoring Conference

    The 2019 Volunteer Water Monitoring Conference was held on April 5, 2019 at Three Rivers Community College in Norwich, CT. The conference was organized by the CT DEEP in collaboration with partners, and marked the 20 year anniversary of the DEEP Volunteer Water Monitoring Program. The event featured five concurrent oral presentation sessions and workshops as well as a student poster session. More than 100 volunteer water monitoring groups from across Connecticut were represented.