WY
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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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Wolf River basin
The Wolf River basin lies in northern and central Wisconsin and drains 3,690 square miles. It includes all of Waupaca County and parts of Forest, Langlade, Marathon, Menominee, Oneida, Outagamie, Portage, Shawano, Waupaca, Waushara and Winnebago…
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Upper Wisconsin Basin
The Headwaters Area includes portions of the Upper Wisconsin, Upper Green Bay and Wolf River basins. Headwaters are the upper reaches of a basin or watershed and thus contain smaller streams and rivers tributary to larger waterbodies. This area…
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Upper Rock River Basin
The Upper Rock River basin lies in south-central Wisconsin's eastern ridges. At the north end of the basin, the east, south and west branches of the Rock River come together in Horicon Marsh. From the city of Horicon, on the south edge of the marsh…
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Upper Green Bay Basin
The Upper Green Bay basin consists of 18 watersheds in northeastern Wisconsin, including all of Florence, Marinette and Oconto counties and a major portion of Forest County and smaller regions of Brown, Langlade, Menominee, Outagamie, Shawano and…