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• 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 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.

• 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.

• Stressor Identification and Causal Assessment Work

  Stressor identification involves defining and listing possible sources of pollution, evaluating existing data, designing a sampling program to bracket the sources if additional data are needed, characterizing the causes, and, finally, identifying the most probable cause.

• 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.

• River and Stream Water Monitoring

  DEEP has monitored rivers and streams for water quality since the 1970s. Current annual monitoring efforts include the collection of water chemistry, water temperature, macroinvertebrate community, fish community, periphyton community, and indicator bacteria data from locations throughout the State. This data collected by the Monitoring Program are used to assess the health of individual waterbodies. In addition, the data are used to support a variety of other projects, including evaluation of trends in Connecticut’s water quality in the state, study of the potential impacts of climate change on our waterbodies, and supporting nutrient and temperature criteria development.

• LIS Quality Assurance Project Plans

  Long Island Sound Quality Assurance Project Plans (QAPPs)

• Energy Savings Performance Contracting Program

• Transportation and Climate Initiative Program

• (TCI-P) Transportation and Climate Initiative Program FAQs

  Frequently Asked Questions

• Goodwin Conservation Center School Programs

• Nitrogen Control Program for Long Island Sound

  Each summer, the bottom waters in the western half of Long Island Sound experience hypoxia, or very low levels of dissolved oxygen. Extensive monitoring and modeling of Long Island Sound have identified the excessive discharge of nitrogen from human activities as the primary pollutant causing hypoxia. Nitrogen fuels the growth of algae in the Sound, which eventually decays, consuming oxygen in the process. There is enough nitrogen added by human activity to cause a hypoxia problem each summer.

• Prevention of PFAS Pollution by Minimizing Future Releases

  Information about Connecticut's efforts to minimize future releases of PFAS to the environment including implementation of a firefighting foam take back program and decontamination pilot project, efforts to understand PFAS in consumer packaging, and legislation to limit PFAS in food packaging.

• Potable Water Program – Salt Investigations

• DEEP Regulatory Programs Impacting Land Use