- Impaired waters details
- Search waters
- Restoring water quality
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]
Over 700 waters are on the impaired waters list.
- Updated Lists
The list is updated every even-numbered year.
- Pollutants & impairments
Common impairments and pollutants.
- Water quality
Contaminants impair waters.
- Standards & classifications
Water quality classifications are central to identifing impaired waters.
- Contact us
Email comments, questions.
Last revised: Friday September 11 2015