AMBRIDGE BORO STP | Harmony Township, Pennsylvania Wastewater Treatment Plant

AMBRIDGE BORO STP is a municipal wastewater treatment plant located in Harmony Township, Beaver County, Pennsylvania, along the Ohio River Boulevard. Serving a population of around 9,719, the plant is part of the region's infrastructure managed under the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges to surface waters. As a medium-sized facility, the plant is expected to provide at least secondary treatment, the national standard for municipal wastewater plants under the Clean Water Act. The plant's design and operation are subject to state and federal regulations, with oversight from the Pennsylvania Department of Environmental Protection (PADEP) and the U.S. Environmental Protection Agency (EPA). The treated effluent from AMBRIDGE BORO STP enters the Ohio River, which flows southwest to join the Mississippi River near Cairo, Illinois, and eventually reaches the Gulf of Mexico. The Ohio River supports diverse aquatic life and serves as a drinking water source for millions, making effective wastewater treatment critical for downstream water quality and ecosystem health.

The plant discharges into the Ohio River, a major waterway that drains into the Mississippi River and ultimately the Gulf of Mexico. The Ohio River basin supports a variety of fish and wildlife, including several species of freshwater mussels and migratory birds. Maintaining low nutrient and pollutant loads is essential to prevent algal blooms and hypoxia in the Gulf of Mexico, a recurring ecological concern.