Thames River Basin Partnership
HOME | About | Work Plans | Projects | River Data | Partners

Thames River - Water Quality Data

water quality

Raw Data

The US Geological Survey has CT Water Data shown through an interactive map. It includes gauging stations and both real time and historic data

For live water quality information in the Thames River at the Gold Star Bridge, click here.


Total Maximum Daily Loads (TMDLs) for known causes of water quality impairment have been developed for some Thames watershed areas.  To learn about TMDLs and to see specific TMDL data for the Thames, click here.

Water Quality Plans and Watershed Management Plans

The Thames Science Plan outlines water-quality investigations that could provide information necessary for the CT-DEP to develop water-quality management and restoration strategies for nutrient-related problems in the Thames River Basin. The purpose of the Science Plan is to identify information that would support CT-DEP in developing Total Maximum Daily Load analyses (TMDLs) for nutrients for individual water bodies and stream reaches in the Thames Basin, and eventually for the entire basin, as required under the Federal Clean Water Act.

Regional and Adjoining States

To view the most recent Connecticut Integrated Water Quality Report to Congress, click here.

To learn about Massachusetts' most recent Water Policyacrobat which affects the Upper Thames River Basin (French and Quinebaug watersheds). The MA DEP Watershed-Based Planning site can be viewed here.   A tutorial on how to use the site is also available. For a comprehensive contact list of officials who handle water quality issues in Massachusetts that affect the Thames please click here. This is a good resource to report spills.

Rhode Island DEM has a watershed partnership for the Quinebaug. You can visit their website here.

Climate Change

To view a PowerPoint presentation on Climate Change Science and Local Impacts, prepared by Jen Pagach of the CT DEP Long Island Sound Program, given at the TRBP April 19, 2011 meeting, click here.  It is a very large file (10 MB) so please be patient.

Septic Systems

Everything you need to know about septic systems can be found at the EPA website here.


Files with the icon above are Adobe Acrobat Files. Adobe Reader is necessary to view and print them. To download the free software, click here. This link will also provide information and instructions for downloading and installing the reader.