West Sunbury Boro Wastewater Treatment Plant, Clay Township, Pennsylvania

West Sunbury Boro is a wastewater treatment plant located in Clay Township, Butler County, Pennsylvania, serving a small population of 287 residents. The facility operates under the regulatory framework of the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges to surface waters. As a small municipal plant, it is subject to state-level oversight by the Pennsylvania Department of Environmental Protection. The plant provides advanced treatment, which goes beyond secondary treatment to remove additional nutrients and contaminants. Its designed capacity is 113.56 million gallons per year, matching the reported discharge volume, indicating full utilization. Advanced treatment typically involves processes such as tertiary filtration, nutrient removal, or disinfection. The treated effluent is discharged into a local waterway that ultimately drains into the Ohio River basin. The plant's location in western Pennsylvania places it within the larger Mississippi River watershed. The surrounding area is predominantly rural, with the plant playing a key role in protecting local streams and groundwater from untreated sewage. Advanced treatment helps reduce nutrient loading, which is beneficial for downstream aquatic ecosystems.

The plant discharges into a tributary of the Ohio River, which flows into the Mississippi River and eventually the Gulf of Mexico. This watershed supports diverse aquatic life and is an important migratory corridor for fish. The advanced treatment helps minimize nutrient pollution, which can cause algal blooms and hypoxia in downstream waters like the Gulf of Mexico dead zone.