Williamstown Boro STP - Secondary Wastewater Treatment in Williams Township, Pennsylvania

Williamstown Boro STP is a municipal wastewater treatment facility located in Williams Township, Dauphin County, Pennsylvania. The plant serves a population of approximately 1,667 residents and operates under the regulatory framework of the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. The plant provides secondary treatment, a standard level for small communities in the United States. With a designed capacity of 1,419.53 megaliters per year and an actual discharge volume of 946.35 megaliters per year, the facility operates below its capacity. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local water body that ultimately drains into the Susquehanna River basin, which flows into the Chesapeake Bay. The Chesapeake Bay is a large estuary of ecological significance, supporting diverse aquatic life and migratory species. The plant's operations contribute to protecting water quality in this sensitive watershed.

The plant discharges into a tributary of the Susquehanna River, which flows south through Pennsylvania and Maryland into the Chesapeake Bay. The Chesapeake Bay is the largest estuary in the United States, supporting a rich ecosystem of fish, crabs, and waterfowl. Nutrient pollution from wastewater can contribute to algal blooms and hypoxia in the bay, making effective treatment critical for downstream environmental health.