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Impaired waters

Impaired waters details
Search waters
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 2014 Updates]

In the 2014 list update, 192 new waters were added. A majority of the listing additions are waters that exceed total phosphorus criteria. A significant number of new listings are also based on poor biological condition.

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

A dense carpet of algae smothers the stream.

Over 700 waters are on the impaired waters list.

Updated Lists
Manure runoff from feedlots and grazing areas can impair water.

The list is updated every even-numbered year.

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: Friday September 11 2015