WPDESWisconsin Pollutant Discharge Elimination System
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The system's WPDES permit requires the system to address water quality issues by reducing pollutants washing off streets and other impervious surfaces into Lake Michigan.
Water quality trading is one of many tools available to Wisconsin Pollutant Discharge Elimination System (WPDES) permit holders in order to comply with new, more restrictive water quality-based effluent limitations.
In 2010, the WDNR implemented one of the most stringent phosphorus discharge standards in the US, requiring WPDES permit holders to discharge phosphorus at concentrations at or below 0.075 mg/L.