1 Appendix B-1. List of Impaired Waters for Connecticut (EPA Category 5) 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT1001- 00-1- Wyassup Lake (North Stonington) Fish Consumption MERCURY L1_01 CT2000- Fenger Brook (Waterford)-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 30_01 CT2101- Wheeler Brook (Stonington)-01 ESCHERICHIA COLI (E. COLI) 01_01 Recreation CT2101- Donahue Brook (Stonington)-01 ESCHERICHIA COLI (E. COLI) 03_01 Recreation CT2202- Latimer Brook (East Lyme)-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 2 CT2204- Stony Brook (Waterford)-01 Recreation ESCHERICHIA COLI (E. COLI) 03_01 CT2205- 02-1- Dodge Pond (East Lyme) Fish Consumption MERCURY L1_01 CT3002- 02-1- Amos Lake (Preston) Recreation ALGAE L2_01 CT3002- 02-1- Amos Lake (Preston) Recreation CHLOROPHYLL-A L2_01 CT3002- 02-1- Amos Lake (Preston) Recreation NUTRIENTS L2_01 CT3004- Oxoboxo Brook-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_01 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT3006- Hunts Brook (Waterford)-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_01 Willimantic River CT3100- (Tolland/Willington/Ellington/Staffo Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_05 rd)-05 Willimantic River CT3100- (Tolland/Willington/Ellington/Staffo ESCHERICHIA COLI (E. COLI) 00_05 rd)-05 Recreation CT3207- Roberts Brook (Mansfield)-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 12_01 CT3208- 3 Sawmill Brook (Mansfield)-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 CT3208- Conantville Brook (Mansfield)-01 Recreation ESCHERICHIA COLI (E. COLI) 02_01 CT3300- Quinatissett Brook (Thompson)-01 Recreation ESCHERICHIA COLI (E. COLI) 10_01 CT3700- Quinebaug River (Lisbon/Griswold)- Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_01 01 CT3700- Quinebaug River (Putnam)-04 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_04 CT3700- Quinebaug River Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_05 (Putnam/Thompson)-05 CT3700- Quinebaug River Recreation ESCHERICHIA COLI (E. COLI) 00_05 (Putnam/Thompson)-05 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT3700- 00- West Thompson Lake (Thompson) Habitat for Fish, Other Aquatic Life and Wildlife ALGAE 2+L1_01 CT3700- 00- West Thompson Lake (Thompson) Habitat for Fish, Other Aquatic Life and Wildlife CHLOROPHYLL-A 2+L1_01 CT3700- 00- West Thompson Lake (Thompson) Habitat for Fish, Other Aquatic Life and Wildlife NUTRIENTS 2+L1_01 CT3700- 00- West Thompson Lake (Thompson) Recreation ALGAE 2+L1_01 CT3700- 4 00- West Thompson Lake (Thompson) Recreation CHLOROPHYLL-A 2+L1_01 CT3700- 00- West Thompson Lake (Thompson) Recreation NUTRIENTS 2+L1_01 CT3700- Aspinook Pond 00- Recreation ALGAE (Canterbury/Griswold/Lisbon) 5+L4_01 CT3700- Aspinook Pond 00- Recreation CHLOROPHYLL-A (Canterbury/Griswold/Lisbon) 5+L4_01 CT3700- Aspinook Pond 00- Recreation NUTRIENTS (Canterbury/Griswold/Lisbon) 5+L4_01 CT3700- Durkee Brook (Pomfret)-01 Recreation ESCHERICHIA COLI (E. COLI) 17_01 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT3708- Little River (Putnam/Woodstock)-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 CT3708- 00-1- Roseland Lake (Woodstock) Recreation NUTRIENTS L1_01 CT3708- Wheatons Brook Recreation ESCHERICHIA COLI (E. COLI) 18_01 (Putnam/Thompson)-01 CT3709- Wappaquoia Brook-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 CT3709- Day Brook (Pomfret)-01 Recreation ESCHERICHIA COLI (E. COLI) 02_01 CT3800- Shetucket River (Norwich)-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 5 CT3800- 00- Spaulding Pond (Norwich) Recreation ESCHERICHIA COLI (E. COLI) 6+L3_01 CT3805- Little River (Sprague)-02 Fish Consumption MERCURY 00_02 CT3805- Little River (Sprague)-02 Fish Consumption POLYCHLORINATED BIPHENYLS (PCBS) 00_02 CT3805- Little River (Sprague)-02 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_02 CT3805- Little River (Sprague)-02 Habitat for Fish, Other Aquatic Life and Wildlife WHOLE EFFLUENT TOXICITY (WET) 00_02 CT3805- 00-3- Papermill Pond (Sprague) Fish Consumption MERCURY L6_01 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT3805- 00-3- Papermill Pond (Sprague) Fish Consumption POLYCHLORINATED BIPHENYLS (PCBS) L6_01 CT3805- 00-3- Versailles Pond (Sprague) Fish Consumption MERCURY L7_01 CT3805- 00-3- Versailles Pond (Sprague) Fish Consumption POLYCHLORINATED BIPHENYLS (PCBS) L7_01 CT3805- 00-3- Versailles Pond (Sprague) Habitat for Fish, Other Aquatic Life and Wildlife NUTRIENTS L7_01 CT3900- Unnamed Trib, Yantic River Habitat for Fish, Other Aquatic Life and Wildlife AMMONIA, UN-IONIZED 6 00_trib_01 (Norwich Landfill)-01 CT3900- Unnamed Trib, Yantic River Habitat for Fish, Other Aquatic Life and Wildlife COPPER 00_trib_01 (Norwich Landfill)-01 CT3900- Unnamed Trib, Yantic River Habitat for Fish, Other Aquatic Life and Wildlife DISSOLVED OXYGEN 00_trib_01 (Norwich Landfill)-01 CT3900- Unnamed Trib, Yantic River Habitat for Fish, Other Aquatic Life and Wildlife LEAD 00_trib_01 (Norwich Landfill)-01 CT3900- Unnamed Trib, Yantic River Habitat for Fish, Other Aquatic Life and Wildlife NUTRIENTS 00_trib_01 (Norwich Landfill)-01 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT3900- Unnamed Trib, Yantic River ORGANIC ENRICHMENT (SEWAGE) Habitat for Fish, Other Aquatic Life and Wildlife 00_trib_01 (Norwich Landfill)-01 BIOLOGICAL INDICATORS CT3900- 00- Browning Pond (Norwich Landfill)- Habitat for Fish, Other Aquatic Life and Wildlife AMMONIA, UN-IONIZED UL_pond_ 01 01 CT3900- 00- Browning Pond (Norwich Landfill)- Habitat for Fish, Other Aquatic Life and Wildlife COPPER UL_pond_ 01 01 CT3900- 00- Browning Pond (Norwich Landfill)- Habitat for Fish, Other Aquatic Life and Wildlife DISSOLVED OXYGEN 7 UL_pond_ 01 01 CT3900- 00- Browning Pond (Norwich Landfill)- Habitat for Fish, Other Aquatic Life and Wildlife LEAD UL_pond_ 01 01 CT3900- 00- Browning Pond (Norwich Landfill)- Habitat for Fish, Other Aquatic Life and Wildlife NUTRIENTS UL_pond_ 01 01 CT3900- 00- Browning Pond (Norwich Landfill)- ORGANIC ENRICHMENT (SEWAGE) Habitat for Fish, Other Aquatic Life and Wildlife UL_pond_ 01 BIOLOGICAL INDICATORS 01 CT3900- Kahn Brook (Bozrah)-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 07_01 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT3900- Kahn Brook (Bozrah)-01 Habitat for Fish, Other Aquatic Life and Wildlife PHOSPHORUS, TOTAL 07_01 CT3900- Kahn Brook (Bozrah)-01 Recreation ESCHERICHIA COLI (E. COLI) 07_01 CT3902- Bartlett Brook (Lebanon)-02 Recreation ESCHERICHIA COLI (E. COLI) 00_02 CT3905- Pease Brook Recreation ESCHERICHIA COLI (E. COLI) 00_01a (Bozrah/Franklin/Lebanon)-01a CT3907- Susquetonscut Brook-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 CT4000- Connecticut River-01 Fish Consumption POLYCHLORINATED BIPHENYLS (PCBS) 8 00_01 CT4000- Connecticut River-02 Fish Consumption POLYCHLORINATED BIPHENYLS (PCBS) 00_02 CT4000- Connecticut River-02 Recreation ESCHERICHIA COLI (E. COLI) 00_02 CT4000- Connecticut River Fish Consumption POLYCHLORINATED BIPHENYLS (PCBS) 00_03 (Portland/Suffield)-03 CT4004- Farm Brook (South Windsor)-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 02_01 CT4013- Sumner Brook (Middletown)-02 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_02 CT4013- 05-1- Crystal Lake (Middletown) Recreation ESCHERICHIA COLI (E. COLI) L1_01 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT4100- Stony Brook (Suffield)-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_01 CT4100- Stony Brook (Suffield)-03 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_03 CT4101- Muddy Brook (Suffield)-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_01 CT4200- Scantic River-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_01 CT4200- Scantic River-01 Recreation ESCHERICHIA COLI (E. COLI) 9 00_01 CT4200- Scantic River-02 Recreation ESCHERICHIA COLI (E. COLI) 00_02 CT4200- Scantic River-03 Recreation ESCHERICHIA COLI (E. COLI) 00_03 CT4200- Thrasher Brook (Somers)-01 Recreation ESCHERICHIA COLI (E. COLI) 15_01 CT4200- Dry Brook (South Windsor/East Recreation ESCHERICHIA COLI (E. COLI) 28_01 Windsor)-01 CT4202- Gillettes Brook (Somers)-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 CT4203- Gulf Stream (Somers)-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 CT4204- Abbey Brook (Somers)-01 Recreation ESCHERICHIA COLI (E. COLI) 00_01 2020 IWQR Appendix B-1 List of Impaired Waters for Connecticut (EPA Category 5) Waterbod y Segment Waterbody Name Impaired Designated Use Cause ID CT4206- Broad Brook (East Windsor)-01 Habitat for Fish, Other Aquatic Life and Wildlife CAUSE UNKNOWN 00_01 CT4206- Broad Brook (East Windsor- Habitat for Fish,