Washingtonville WWTP and Sewer System - Advanced Wastewater Treatment in Ohio

Washingtonville WWTP and Sewer System is a municipal wastewater treatment facility located in Washingtonville, Columbiana County, Ohio, United States. It serves a population of approximately 832 residents, making it a small-scale plant within the state's wastewater infrastructure. The plant employs advanced treatment processes, exceeding the secondary treatment standard required by the U.S. Clean Water Act. It has a designed capacity of 454.25 thousand cubic meters and currently treats 272.55 thousand cubic meters annually, indicating operational headroom. As a U.S. facility, it operates under National Pollutant Discharge Elimination System (NPDES) permits issued by the Ohio Environmental Protection Agency, which set effluent limits to protect water quality. The treated effluent is discharged into a local water body within the Ohio River basin, ultimately draining into the Mississippi River and the Gulf of Mexico. The plant plays a key role in safeguarding local streams and the broader watershed from nutrient pollution and pathogens, supporting aquatic life and downstream communities.

The plant discharges into a tributary of the Ohio River, which flows into the Mississippi River and empties into the Gulf of Mexico. This watershed supports diverse aquatic ecosystems, including fish and macroinvertebrate communities. The advanced treatment helps reduce nutrient loads that could otherwise contribute to algal blooms and hypoxia in the Gulf of Mexico.