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Water Quality and Planning

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Water Quality and Planning

This page provides quick links to water quality and quantity information and documents related to conserving our inland and coastal water resources.

Water Quality and Quantity Data and Planning Documents

Under the provisions of the Clean Water Act, all states are required to file an Integrated Water Quality Report to Congress every two years. These links will bring you to the most current report filed by Connecticut, Massachusetts and Rhode Island:
Connecticut Integrated Water Quality Report
Massachusetts Integrated Water Quality Report
Rhode Island Integrated Water Quality Report

The United States Geological Survey (USGS) monitors stream flow in many places throughout the Thames watershed. The map at this link will allow you to click on a gaged river stations and read the real-time flow data, or download the flow history.

You may find additional water-quality data of interest in EPA STORET.

Water Quality Studies in the Thames Watershed

USGS National Water-Quality Assessment Program Connecticut, Housatonic and Thames River Basins Study

Additional Water Quality Data

The Eco-Sheds stream temperature database covers stream temperature monitoring for all of New England.

The Riffle Bioassessment by Volunteers program (RBV) is a Connecticut statewide volunteer water quality monitoring program coordinated by the CT DEEP. Each fall RBV volunteers participate in a ‘treasure hunt’ to find Connecticut’s healthiest streams. To accomplish this, RBV volunteers are trained to collect ‘macroinvertebrates,’ or ‘river bugs’ from their local rivers and streams. Depending on the types of macroinvertebrates that volunteers find in a stream, the CT DEEP can assess it as a healthy stream. Here is a link to more information about these bugs and a story map that shows the results collected in streams near you since 1999.

Would you like to become involved with volunteer water quality monitoring? The Last Green Valley sponsors a volunteer water quality monitoring program in eastern Connecticut and south central Massachusetts. Learn more at this link.

Watershed Based Plans and Total Maximum Daily Loads

Under the Federal Clean Water Act, each state is required to set water quality standards.
Connecticut Water Quality Standards
Massachusetts Water Quality Standards
Rhode Island Water Quality Standards

When surface water does not meet the state standards, a watershed based plan is required to describe the steps necessary to bring the water quality back into compliance. Another tool for restoring water quality is to develop a Total Maximum Daily Load (TMDL) for a pollutant. An approved watershed based plan is a requirement for certain funding sources to fund cleanup of pollution at the source.

Connecticut Watershed Based Plans
Connecticut TMDLs
Massachusetts Watershed Based Plans
MA DEP Watershed Plan Development Tool
MA DEP TMDL
Rhode Island Watershed Based Plan
Rhode Island TMDL

Coastal Zone Resources

The Thames River watershed is the third largest land area to drain into Long Island Sound. Water quality in Long Island Sound is impacted by land use as far north as Spencer and Leicester, MA. Several planning documents and studies consider distant sources of water pollution.

Long Island Sound Comprehensive Conservation and Management (CCMP) Plan 2015
Connecticut Coastal Management Manual
Long Island Sound Study
Long Island Sound Sound Keeper Program

The Long Island Sound Blue Plan was created to protect traditional uses, minimize conflicts, and maximize compatibility in Long Island Sound, now and in the future. This includes preserving Long Island Sound’s ecosystems and resources, and facilitating a transparent, science-based decision-making process.