Millville Boro STP - Wastewater Treatment Plant in Millville, Pennsylvania

Millville Boro STP is a municipal wastewater treatment facility located on Morehead Avenue in Millville, Columbia County, Pennsylvania. The plant serves a small population of 969 residents, reflecting the rural character of the area. It operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal discharges. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 946.35 cubic meters per day and an average daily discharge of 378.54 cubic meters, the facility operates below its capacity, indicating room for future growth. As a U.S. plant, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Pennsylvania Department of Environmental Protection, which set effluent limits to protect water quality. The treated effluent is discharged into a local waterway, likely a tributary of the Susquehanna River basin, which ultimately drains into the Chesapeake Bay. The Chesapeake Bay is a large estuary of ecological significance, supporting diverse aquatic life and fisheries. The plant's discharge contributes to the nutrient and pollutant load in the watershed, making its treatment performance important for downstream water quality.

The plant discharges into a local stream within the Susquehanna River basin, which flows southward into the Chesapeake Bay. The Chesapeake Bay is a major estuary that supports a complex ecosystem, including blue crabs, oysters, and migratory fish. Nutrient pollution from wastewater treatment plants is a key concern for the bay's health, as excess nitrogen and phosphorus can cause algal blooms and hypoxia. The plant's secondary treatment helps reduce these impacts, but advanced nutrient removal may be needed in sensitive areas.