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Impaired Waters and TMDLs
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Region 1 Impaired Waters and 303(d) Lists by State

Under Section 303(d) of the Clean Water Act (CWA), states, territories, and authorized tribes (referred to as 'states' below) are required to develop, and update every two years, lists of waters - rivers, lakes, coastal waters and estuaries - that are impaired (or threatened) by one or more pollutants. Impaired waters are waters that do not meet Water Quality Standards (WQSs) even after point sources of pollution (e.g., municipal and industrial discharges) have installed required levels of pollution controls. In addition to listing impaired waters, each state prioritizes TMDLs for development.

States must consider "all existing and readily available information" when developing their lists. Along with the list, each state submits a listing methodology to EPA. At EPA's request, states must provide "good cause" for not including or removing a water from the list. To read the impaired waters lists for New England states please go to the links below under "New England State Pages".

EPA Listing Information:

  • Guidance for Assessment, Listing, and Reporting Requirements Pursuant to Sections 303(d), 305(b) and 314 of the Clean Water Act
  • EPA National TMDL Technical Support Documents

EPA Approval Documentation for the New England States' Impaired Waters/303(d) Lists

303(d) lists are organized by state and in chronological order, with the most recently approved impaired waters listed first. The tables will be updated continuously as lists are approved.

  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Rhode Island
  • Vermont

Many of the 303(d) list documents submitted to EPA by the States appear in their TMDL or 303(d) list web pages (links in the table below). Please note that the document that contains the 303(d) list may be labeled "Integrated Report", and that the 303(d) list itself may be found in an appendix part of the document.

List Cycle
(List Report)
Partial Approval Date Final/Full Approval Date Approval Documents
Connecticut (State of Connecticut 303(d) list Web site)
2020 N/A November 17, 2020 2020 CT Approval Documents (pdf) (345 K)
2018 N/A September 26, 2019 2018 CT Approval Documents (pdf) (1 MB)
2016 (pdf) (7.1 MB) N/A June 8, 2017 2016 CT Approval Documents (pdf) (173 K)
2014 (pdf) (7.1 MB) N/A November 17, 2014 2014 CT Approval Documents (pdf) (392 K)
2012 (pdf) (6.6 MB) N/A January 30, 2013 2012 CT Approval Documents (pdf) (95 K)
2010 (pdf) (8.1 MB) N/A September 19, 2011 2010 CT Approval Documents (pdf) (86 K)
2008 (pdf) (4.5 MB) N/A November 4, 2008 2008 CT Approval Documents (pdf) (657 K)
2006 (pdf) (3.4 MB) N/A September 21, 2007 2006 CT Approval Documents (pdf) (3 MB)
2004 (pdf) (590 K) N/A June 24, 2004 2004 CT Approval Documents (pdf) (47 K)
List Cycle
(List Report)
Partial Approval Date Final/Full Approval Date Approval Documents
Maine (State of Maine 303(d) Web site)
2018/2020/2022 N/A May 25, 2022 2018/2020/2022 ME approval documents (pdf) (242 K)
2016 N/A February 28, 2018 2016 ME Approval Documents (pdf) (153 K)
2014 (pdf) (1.6 MB) N/A February 15, 2017 2014 ME Approval Documents (pdf) (139 K)
2012 (pdf) (1.9 MB) N/A March 20, 2014 2012 ME Approval Documents (pdf) (604 K)
2010 (pdf) (5.2 MB) N/A September 20, 2011 2010 ME Approval Documents (pdf) (76 K)
2008 (pdf) (7.3 MB) N/A August 21, 2008 2008 ME Approval Documents (pdf) (67 K)
2006 (pdf) (5.2 MB) N/A September 18, 2007 2006 ME Approval Documents (pdf) (80 K)
2004 (pdf) (10.3 MB) May 9, 2005 September 28, 2006 2004 ME Partial Approval Documents (pdf) (623 K)
2004 ME Final Approval Documents (pdf) (90 K)
List Cycle
(List Report)
Partial Approval Date Final/Full Approval Date Approval Documents
Massachusetts (State of Massachusetts 303(d) Web Site)
2018-2020 N/A February 2nd, 2022 2018-2020 MA Approval Documents (pdf) (562 K)
2016 N/A January 2, 2020 2016 MA Approval Documents (pdf) (2 MB)
2014 (pdf) (2.6 MB) N/A February 23, 2016 2014 MA Approval Documents (pdf) (405 K)
2012 (pdf) (2.2 MB) N/A May 2, 2013 2012 MA Approval Documents (pdf) (77 K)
2010 (pdf) (1.8 MB) N/A November 16, 2011 2010 MA Approval Documents (pdf) (133 K)
2008 (pdf) (1.5 MB) N/A May 4, 2009 2008 MA Approval Documents (pdf) (73 K)
2006 (pdf) (1.4 MB) N/A September 28, 2007 2006 MA Approval Documents (pdf) (527 K)
2004 (pdf) (2 MB) June 21, 2006 February 6, 2007 2004 MA Partial Approval Documents (pdf) (220 K)
2004 MA Final Approval Documents (pdf) (243 K)
List Cycle
(List Report)
Partial Approval Date Final/Full Approval Date Approval Documents
New Hampshire (State of New Hampshire 303(d) Web site)
2020-2022 N/A March 14, 2022 2020-2022 Combined 303(d) List Approval Documents (pdf) (304 K)
2018 N/A February 25, 2020 2018 NH Approval Documents (pdf) (228 K)
2016 Partial Approval
June 22, 2018
  2016 NH Partial Approval Documents (pdf) (156 K)
 
2014 Partial Approval
March 16, 2018
  2014 NH Partial Approval Documents (pdf) (335 K)
 
2012 (pdf) (494 K) N/A

September 24, 2015

2012 NH Approval Documents (pdf) (86 K)
2010 (pdf) (6.3 MB) N/A September 7, 2011 2010 NH Approval Documents (pdf) (5 MB)
2008 (pdf) (4.2 MB) N/A September 30, 2009 2008 NH Approval Documents (pdf) (3 MB)
2006 (pdf) (3.9 MB) N/A August 30, 2007 2006 NH Approval Documents (pdf) (98 K)
2004 (pdf) (1.3 MB) June 9, 2005 September 13, 2005 2004 NH Partial Approval Documents (pdf) (44 K)
2004 NH Federal Register Notice
2004 NH Follow Up Letter (pdf) (17 K)
List Cycle
(List Report)
Partial Approval Date Final/Full Approval Date Approval Documents
Rhode Island (State of Rhode Island 303(d) Web site)
2022 N/A March 9, 2022 2022 RI Approval Documents (pdf) (220 K)
2018-2020 N/A February 17, 2021 2018-2020 RI Approval Documents (pdf) (285 K)
2016 N/A April 11, 2018 2016 RI Approval Documents (pdf) (231 K)
2014 (pdf) (321 K) N/A June 3, 2015 2014 RI Approval Documents (pdf) (85 K)
2012 (pdf) (486 K) N/A September 27, 2012 2012 RI Approval Documents (pdf) (113 K)
2010 (pdf) (854 K) N/A July 14, 2011 2010 RI Approval Documents (pdf) (114 K)
2008 (pdf) (278 K) N/A July 29, 2008 2008 RI Approval Documents (pdf) (87 K)
2006 (pdf) (573 K) N/A November 17, 2006 2006 RI Approval Documents (pdf) (66 K)
2004 (pdf) (197 K) N/A September 27, 2005 2004 RI Approval Documents (pdf) (43 K)
List Cycle
(List Report)
Partial Approval Date Final/Full Approval Date Approval Documents
Vermont (State of Vermont 303(d) Web site)
2020 N/A September 17, 2020 2020  VT Approval Documents (pdf) (323 K)
2018 N/A September 5, 2018 2018 VT Approval Documents (pdf) (198 K)
2016 (pdf) (197 K) N/A September 7, 2016 2016 VT Approval Documents (pdf) (49 K)
2014 (pdf) (185 K) N/A September 30, 2014 2014 VT Approval Documents (pdf) (9 MB)
2012 (pdf) (211 K) N/A June 13, 2012 2012 VT Approval Documents (pdf) (82 K)
2010 (pdf) (1.9 MB) N/A June 15, 2011 2010 VT Approval Documents (pdf) (62 K)
2008 (pdf) (72 K) N/A September 24, 2008 2008 VT Approval Documents (pdf) (41 K)
2006 (pdf) (118 K) N/A March 1, 2007 2006 VT Approval Documents (pdf) (1 MB)
2004 (pdf) (2 MB) N/A July 19, 2004 2004 VT Approval Documents (pdf) (45 K)
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Last updated on June 16, 2022
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