Lake Winona Phosphorus Reduction Project Total Maximum Daily Load Report

The Clean Water Act (1972) requires that each State address any waterbody that is deemed impaired according to state regulations. A Total Maximum Daily Load (TMDL) Study is thus required by the U.S. Environmental Protection Agency (EPA) as a result of the federal Clean Water Act. A TMDL identifies the pollutant that is causing the impairment, how much of that pollutant can enter the waterbody and still allow it to meet water quality standards, and apportions load reductions to the various sources of the pollutant. This TMDL study is for Lake Winona, which is located in the Long Prairie River Watershed (Hydrologic Unit Code [HUC] 07010108), in central Minnesota. Lake Winona was listed in 2002 on the EPA 303(d) list of impaired waters due to elevated phosphorus levels.