Property/Site Owners
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Public Participation in Water Quality Assessments
The DNR is seeking data on the water quality of lakes, streams and rivers in our state. Along with Department data, submitted data will be used to assess the quality of our state's water resources and pinpoint problem areas. Data will be…
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Surface Water Quality Assessment Process
Subscribe to receive updates about water quality standards and assessments. The Clean Water Act (CWA) requires states to assess the quality of its surface waters and report the results to the public.
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Surface Water Impairments and Pollutants
Impaired waters are identified by comparing monitoring results for a given water to water quality parameter thresholds, which provide guidelines for identifying water quality conditions. Impaired waters in Wisconsin are affected by a variety of…
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Featured water restorations
Since 2002, Wisconsin has delisted 147 individual streams, lakes and beaches, representing approximately 500 stream miles and 52,800 lake acres. Below are a few stories of the road to these waters' aquatic health recovery.
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Water Condition Lists
Every two years, Sections 303(d) and 305(b) of the Clean Water Act (CWA) require states to publish a list of all waters not meeting water quality standards and an overall report on surface water quality status of all waters in the state. To comply…
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Water Quality Modeling Tools
Water quality modeling tools can be used to better understand and evaluate the impacts of management decisions on Wisconsin's surface waters. Each model was developed for a specific purpose and requires an understanding of the inputs, outputs and…
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Help and Tips for SWIMS
To meet Department development standards, the SWIMS user interface has undergone a redesign. Along with meeting these development standards, the additional goals of this redesign are to update SWIMS with a modern look, create a standardize layout,…
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Surface Water Integrated Monitoring System (SWIMS) Database
Subscribe for updates about the SWIMS system The Surface Water Integrated Monitoring System (SWIMS) is a DNR system that holds chemistry (water, sediment, fish tissue) data, physical data, biological (macroinvertebrate, aquatic invasives…
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Wisconsin's Great Lakes Strategy
The Great Lakes contain 20% of the world's available fresh surface water supply. Because of that, the Great Lakes are critical to the health and welfare of all the Great Lakes states. Effective management of both wetland and water quantity and…
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Office of Great Waters Staff Contacts
Staff in the DNR’s Office of Great Waters collaborate with federal, state and local agencies; tribes; businesses; citizen-led organizations and community members to protect and improve the environmental quality of the Great Lakes and Mississippi…