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Wisconsin's 2018 impaired waters list

Every two years, Section 303(d) of the Clean Water Act requires states to publish a list of all waters that are not meeting water quality standards. In the proposed 2018 list update, DNR proposes to add 242 new waterbody segments. A majority of the listing additions were waters that exceed total phosphorus criteria. Thirty-five waterbodies are proposed to be delisted.

A 30-day public comment period was held November 2017 through January 2018. The final documents are listed below.

Final 2018 impaired waters list materials

Final documents

Data viewing tools


Clean Water Act webinar

A webinar was held in December 2017 about the process DNR used to develop the 2018 impaired waters list.

Previous impaired waters lists

Impaired waters lists

2016PDF, Excel
2014PDF, Excel
2002PDF, Excel
EPA approval documents

2016 Cover letter
Decision doc
Tribal consult
2014 Cover letter
Decision doc
2012Cover letter & decision doc
2010 Cover letter
Decision doc
2008 Partial approval letter & decision doc
Full approval letter & decision doc
2006Cover letter & decision doc
WDNR response to public comments

Prior to sending an impaired waters list to the EPA for federal review, the list is sent out for a public comment period. These are the WDNR’s responses to public comment for each cycle.




Additional supporting documentation

Each assessment cycle there are potentially additional informational documents like fact sheets, public webinar materials, and listing justifications. Relevant documents are listed in this section.




Last revised: Friday February 21 2020