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Impaired waters list
Year 2016 impaired waters list.
Approved TMDLs
Waters with approved TMDLs.
Assessment methods
Assessment methods are used to evaluate water condition.
Clean Water Act Webinar online!

A webinar was held December 13, 2017, to provide an opportunity to learn more about the process DNR used to develop the 2018 impaired waters list.

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 240 new water 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 started on November 15, 2017 and has been extended to January 8, 2018. Comments can be emailed to the DNR at, or sent by U.S. mail to Ashley Beranek, DNR, Water Evaluation Section (WY/3), Box 7921, Madison, WI 53707.

Comments emailed, postmarked, or received by January 8, 2018 will be considered before submitting the final draft list to the U.S. Environmental Protection Agency for approval.

Public Comment Materials

The Impaired Waters Search Tool may be used to search DNR’s WATERS database for previous and current impaired waters listings, as well as listing update proposals. A help guide for using the search tool [PDF] is available.

The Surface Water Data Viewer can be used to search for impaired waters listings and proposed listings in an interactive mapping application. To view impaired waters on the map, click the “Show Layers” button to expand the “Impairments and Assessments” grouping and check the “Impaired Waters Status” layer. The definitions of the listing status categories are provided here.

Contact information
For information contact:
Impaired Waters Program
Last revised: Tuesday January 02 2018