Source to Sink Analysis of Phosphorus Transport: The Potential Role of Groundwater Discharge in Lake Eutrophication Events in Western Wisconsin&nbsp;<br><br>Phosphorus loading in Wisconsin is responsible for significant lake eutrophication throughout the state, with severe societal and economic impacts. Historically, phosphorous source has been attributed to agricultural inputs delivered by surface water runoff; however, ongoing investigations at UW-Eau Claire suggest that phosphorus occurs in high concentrations in groundwater, and may originate from both agriculture and naturally-occurring phosphorus in the bedrock. Understanding the potential role of groundwater in lake eutrophication is critical for effective lake management and land use practice regulations