Berlin STP Wastewater Treatment Plant, City of Berlin, Wisconsin

Berlin STP is a municipal wastewater treatment plant located in Berlin, Wisconsin, United States. It serves a population of about 5,285 residents, classifying it as a small to medium-sized facility. The plant is situated at 853 North Wisconsin Street and operates under the regulatory framework of the US Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. Plants of this scale in Wisconsin typically employ secondary treatment, often using activated sludge or lagoon systems. The designed capacity is 1.00 million gallons per day, indicating the plant's ability to handle peak flows. It is assumed to comply with state and federal regulations. The treated effluent from Berlin STP is discharged into a local water body, likely the Fox River or a tributary, which flows into Lake Winnebago and ultimately to Green Bay and Lake Michigan. This watershed supports diverse aquatic life and recreational activities. The plant plays a key role in protecting downstream water quality by removing pollutants before discharge.

Berlin STP discharges into the Fox River watershed, which drains into Lake Winnebago, the largest inland lake in Wisconsin. From there, water flows through the Lower Fox River to Green Bay and Lake Michigan. The receiving waters support a variety of fish species and are important for recreation and tourism. The plant's treatment helps reduce nutrient loading, which can cause algal blooms in the lake and bay.