Connecticut 303(d) Impaired Waters\n2022 is a subset of Connecticut 305(b) Assessed Waters 2022. If any one of the\nassigned designated uses is categorized as NOT Supporting, the assessed\nwaterbody is included in this subset and is considered impaired. Additional\ninformation about Integrated Water Quality reporting is available on the CT\nDEEP website, Integrated Water\nQuality Report page.
Connecticut 305(b) Assessed Waters\nfiles includes rivers, lakes and estuaries that have been assessed in\ncompliance with Sections 305(b) and 303(d) of the federal Clean Water Act.\nSection 305(b) of the Clean Water Act requires each state to monitor, assess\nand report on the quality of its waters relative to attainment of designated\nuses established by the State's water quality standards. Section 303(d)\nrequires each State to compile a subset of that list identifying only those\nwaters not meeting water quality standards and assign a Total Maximum Daily\nLoad (TMDL) priority ranking to each impaired waterbody.
This assessment is based on\ninformation collected and compiled prior to 2022. It represents conditions at a\nparticular point in time and does not represent current conditions. Depending\non the type of waterbody - river, lake, or estuary - this information\ngeographically displays attainment and non-attainment (e.g. full supporting,\nnot supporting, not assessed) for each designated use - aquatic life, marine\naquatic life, recreation use, fish consumption, shellfish harvesting, and\ndrinking water supply.
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