Impaired 2020 River, Lake, Estuary Set

Connecticut 303(d) Impaired Waters 2020 is a subset of Connecticut 305(b) Assessed Waters 2020. If any one of the assigned designated uses is categorized as NOT Supporting, the assessed waterbody is included in this subset and is considered impaired. Additional information about Integrated Water Quality reporting is available on the CT DEEP website, Integrated Water Quality Report page. Connecticut 305(b) Assessed Waters files includes rivers, lakes and estuaries that have been assessed in compliance with Sections 305(b) and 303(d) of the federal Clean Water Act. Section 305(b) of the Clean Water Act requires each state to monitor, assess and report on the quality of its waters relative to attainment of designated uses established by the State's water quality standards. Section 303(d) requires each State to compile a subset of that list identifying only those waters not meeting water quality standards and assign a Total Maximum Daily Load (TMDL) priority ranking to each impaired waterbody. This assessment is based on information collected and compiled prior to 2020. It represents conditions at a particular point in time and does not represent current conditions. Depending on the type of waterbody - river, lake, or estuary - this information geographically displays attainment and non-attainment (e.g. full supporting, not supporting, not assessed) for each designated use - aquatic life, marine aquatic life, recreation use, fish consumption, shellfish harvesting, and drinking water supply.2020年康涅狄格州（Connecticut）303(d)款受损水体数据集是2020年康涅狄格州305(b)款评估水体数据集的子集。若任一指定用途被归类为未达标（NOT Supporting），则该评估水体将被纳入此子集，并被认定为受损水体。关于综合水质报告的更多信息，可访问CT DEEP官网的综合水质报告页面。 康涅狄格州305(b)款评估水体数据集涵盖了依据联邦《清洁水法》（Clean Water Act）第305(b)款与第303(d)款完成评估的河流、湖泊与河口。《清洁水法》第305(b)款要求各州对辖区内水体水质进行监测、评估，并报告其是否达到州水质标准中设定的指定用途要求。第303(d)款则要求各州从上述评估清单中筛选出未达水质标准的水体子集，并为每一处受损水体分配最大日负荷总量（Total Maximum Daily Load, TMDL）优先级排名。 本评估基于2020年之前收集并整理的数据，仅反映特定时间点的水体状况，不代表当前实际情况。根据水体类型——河流、湖泊或河口——该数据集将以地理可视化形式展示各类指定用途（包括水生生物保护、海洋水生生物保护、娱乐用途、鱼类消费、贝类捕捞以及饮用水供给）的达标与未达标状态（例如完全达标、未达标、未评估）。