Connecticut Department of Energy & Environmental Protection

DEEP headquarters at 79 Elm Street in Hartford is currently closed due to recent water damage impacting multiple areas of the building. We are working to remediate the situation and get the building back open to staff and the public as soon as possible. While the building is closed, Staff continue to work either remotely or in alternate locations. We continue to be able to receive documents via U.S. Mail or courier service, and our electronic file submittal protocols remain unchanged. For updates, please click here

Water

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  • 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.

  • Water Quality Monitoring Program Overview

    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.

  • Stream Connectivity Monitoring

  • Water Monitoring Group Reports and Publications

    This page provides a list of reports and publications produced by the Water Monitoring Group. The Water Monitoring Program collects and interprets physical, chemical, and biological data from State waters. One of the major functions of this program is to support designated use assessments, as required under the Federal Clean Water Act, and this is communicated through the Integrated Water Quality Report. Another key role is to provide summary information of important program elements for use by DEEP and the public.

  • Lake Water Quality Monitoring

    The DEEP Water Monitoring Program conducts ambient monitoring and the related assessment of the State’s waters, including Connecticut's many lakes and ponds. In Connecticut, there are a total of 2,267 lakes and ponds greater than 10 acres in size. The Monitoring Program conducts annual monitoring on approximately 10-20 of these. The type and locations of monitoring during a given year is determined by a variety of factors including participation in regional and national studies as well as support requests from groups within DEEP.

  • Water Monitoring Data Availability

    The DEEP Water Monitoring Group collects a large volume of data, statewide, each year. Data that have gone through the Agency's quality assurance and quality control (QAQC) review process are made publicly available through the following online databases.

  • Ambient Fish Community Monitoring

    Fish are an important component of aquatic life in rivers and streams in Connecticut. The DEEP Water Monitoring group therefore uses fish as one of three biological communities to evaluate the health of waterbodies in Connecticut. (The other two biological communities include benthic macroinvertebrates and diatoms.) Fish have the ability to move within a reach to find better water quality, but they can only do so if there is adequate water present and no barriers to their movement such as dams. Fish are therefore good ‘indicators’ of problems related to water quantity and habitat connectivity. Fish are more sensitive to changes in the amount of water in a stream than other biological communities such as benthic macroinvertebrates, and a fish community with very limited fish can often be a signal of flow-related water quality impairments.

  • Connecticut Lake Watch (Volunteer Lake Monitoring)

    Connecticut Lake Watch is a community-based science project of the DEEP Volunteer Water Monitoring Program. Volunteers are trained to monitor the water quality of local lakes and ponds across Connecticut.

  • PFAS Surface Water and Fish Tissue Monitoring

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

  • Stormwater Quality Manual and Soil Erosion and Sediment Control Guidelines

  • Surface Water Quality

  • Long Island Sound Partnership and DEEP

  • Archive Previous IWQR Cycles

  • 2024_Draft_BacteriaTMDLs

  • Dam Removal

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