Consultants
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Wisconsin’s Consolidated Assessment and Listing Methodology (WisCALM)
Every two years, Sections 303(d) and 305(b) of the Clean Water Act 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 assess surface…
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Antidegradation
The antidegradation rule is implemented in Chapter NR 207 of the Wisconsin Administrative Code. The purpose of the rule is to address new or increased discharges to surface waters (river, lakes, drainage ways, wetlands, etc.). The way in which these…
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Water Quality Criteria
The Clean Water Act requires states to adopt water quality standards to protect aquatic life, wildlife and recreation. Water quality standards consist of three components: antidegradation, designated uses and water quality criteria. Water quality…
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Triennial Standards Review
Final 2025-2027 Triennial Standards Review Workplan Now AvailableThe final work plan, 2025-2027 Triennial Standards Review (TSR) Priorities for the Water Quality Standards Program, is available for download.
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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) data…
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Water Quality Standards Rule Updates
The DNR is conducting rulemaking on several topics related to surface water quality standards, outlined below.
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Pollutant Load Ratio Estimation Tool (PRESTO)
The Pollutant Load Ratio Estimation Tool (PRESTO) is a statewide GIS-based tool that compares the average annual phosphorus loads originating from point and nonpoint sources within a watershed. The comparison provides a screening tool for…
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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…
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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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Sheboygan River Area of Concern
About About the Sheboygan River AOC In 1987, the Sheboygan River was designated as one of 43 Great Lakes Areas of Concern (AOC) – areas that are severely degraded and fail to support aquatic life beneficial for human use (like fish and…