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Impaired waters

Impaired waters details
List updates
Restoring water quality
Wisconsin River

Every two years, Section 303(d) of the Clean Water Act requires states to publish a list of all waters that do not meet water quality standards. The list, also known as the Impaired Waters List, is updated to reflect waters that are newly added or removed based on new information or changes in water quality status. [See 2018 updates]

Read more about specific restorations and/or search and learn about Wisconsin's impaired waters with the Impaired Waters Search Tool. [Use the Impaired Waters Tool]

A dense carpet of algae smothers the stream.

Over 700 waters are on the impaired waters list.

Pollutants & impairments
Cows in the stream.

Common impairments and pollutants.

Water quality
Bass Creek, a listed water.

Contaminants impair waters.

Standards & classifications
River restoration, DNR Biologist

Water quality classifications are central to identifing impaired waters.

Contact us
Melancthon Creek.

Email comments, questions.

Last revised: Thursday December 12 2019