Integrated Water Quality Report to Congress
Prepared Pursuant to Clean Water Act Sections 305(b) and 303(d)
The State of Connecticut Department of Energy and Environmental Protection (CT DEEP) is making available the Draft 2024 Connecticut Integrated Water Quality Report for public review and comment (Public Notice) from September 12, 2025 to October 14, 2025. A public meeting was held via zoom on September 17, 2025 from 11:00 a.m. - 12:30 p.m. (Eastern Time (US and Canada). The presentation slides are now available. Comments must be submitted in writing, directed to Rebecca Jascot at DEEP.IWQR@ct.gov. Visit the interactive online web mapping application to view the 2024 draft assessment results.
Every two years (sometimes referred to as a cycle) Connecticut submits the Integrated Water Quality Report to Congress (IWQR). The report covers two sections of the Clean Water Act (CWA), 305 (b) and 303 (d).
Section 305(b) of the Federal Clean Water Act (CWA) requires each State to monitor, assess and report on the quality of its waters relative to designated uses established in accordance with the Connecticut Water Quality Standards.
Section 303(d) of the CWA requires each State to list waters not meeting water quality standards and prioritize those waters for Total Maximum Daily Load (TMDL) development or other management plans for restoration or protection.
Before each IWQR cycle is finalized and submitted to EPA, CTDEEP conducts an informational meeting and offers an opportunity for the public to review and comment on the report for at least 30 days after the report is public noticed.
2024 Draft IWQR Documents
Download All Draft IWQR Documents
Appendix A-1. Draft 2024 Connecticut 305b Assessment Results for Rivers and Streams
Appendix A-2. Draft 2024 Connecticut 305b Assessment Results for Lakes
Appendix A-3. Draft 2024 Connecticut 305b Assessment Results for Estuaries
Appendix A-4. Draft 2024 Connecticut 305b Site Specific Fish Consumption Advisories
Appendix B-1. Draft 2024 List of Impaired Waters for Connecticut (EPA Category 5 and 5R)
Appendix B-3. Draft 2024 Pollution Control Measures for Waterbody Segments (EPA Category 4b)
Appendix B-4. Draft 2024 Nonpolluting Impairments (EPA Category 4c)
Appendix D-1. Draft 2024 State and Tribal Waters in Connecticut
Previous IWQR Documents
DEEP Water Quality Planning Information Listserv
The Connecticut Department of Energy and Environmental Protection uses the Department web site to provide information about topics pertaining to water quality based programs within Connecticut. If you would like to receive notice of water quality program updates by e-mail, please subscribe to the Water Quality Planning (WQP) Information listserv. Each time the web site is updated with materials relative to water quality based programs, you will receive an email notification with a link to the pertinent web page. To remove your name from the listserv, follow the unsubscribe steps outlined below.
How to Subscribe to the WQP Listserv
If you have an e-mail signature, header, and/or footer set up to be automatically included in emails, you will need to delete these before sending the subscribe request. Send an email to Listserv@List.CT.gov
Leave the subject line blank and in the body of the message type:
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How to Unsubscribe to the WQP Listserv
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CT DEEP is an Affirmative Action and Equal Opportunity Employer that is committed to complying with the Americans with Disabilities Act. To request an accommodation contact us at 860-418-5910 or deep.accommodations@ct.gov.
Content last updated September 18, 2025