MARION STP - Advanced Wastewater Treatment in Marion, Wisconsin

MARION STP is a municipal wastewater treatment facility located in Marion, Wisconsin, United States. The plant serves a population of approximately 1,279 residents and operates under the regulatory framework of the US Clean Water Act, which governs wastewater discharges through National Pollutant Discharge Elimination System (NPDES) permits. As an advanced treatment plant, it provides a higher level of pollutant removal than secondary treatment, ensuring compliance with stringent water quality standards. The plant has a designed capacity of 1,514.16 units and a current discharge volume of 836.58 units, indicating it operates below its maximum capacity. The treatment process employs advanced technologies to reduce nutrients and other contaminants, protecting the local watershed. The plant's discharge ultimately contributes to the regional hydrology of Wisconsin's Fox River basin, which drains into Lake Michigan via Green Bay. The environmental significance of MARION STP lies in its role in safeguarding the water quality of downstream ecosystems. By employing advanced treatment, the plant helps minimize nutrient loading and other pollutants that could impact aquatic life in the Fox River and Lake Michigan. This is particularly important given the ecological sensitivity of the Great Lakes, which support diverse fish populations and provide drinking water for millions.

MARION STP discharges treated wastewater into the local watershed, which is part of the Fox River basin. The Fox River flows into Green Bay and ultimately Lake Michigan, a major freshwater ecosystem supporting diverse aquatic species and serving as a critical water resource. Advanced treatment at this plant helps reduce nutrient pollution, protecting downstream water quality and preventing algal blooms in the Great Lakes.