Gallia Co Mercerville WWTP and Sewers - Advanced Wastewater Treatment in Mercerville, Ohio

Gallia Co Mercerville WWTP and Sewers is a municipal wastewater treatment facility located in Mercerville, Ohio, within Gallia County. The plant serves a small population of 100 residents, reflecting its role in a rural community. It is situated near State Route 218 in Guyan Township. The facility provides advanced treatment, which goes beyond secondary treatment to remove additional nutrients and contaminants. With a designed capacity of 90.85 megaliters per year and an actual discharge volume of 75.71 megaliters per year, the plant operates below its capacity. As a US facility, it operates under the Clean Water Act, with National Pollutant Discharge Elimination System (NPDES) permits issued by the Ohio Environmental Protection Agency, ensuring compliance with water quality standards. The treated effluent is discharged into a local water body, contributing to the Ohio River watershed. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports the overall health of the region's water resources. Its inland location reduces direct marine impact, but careful management is essential to maintain water quality in the receiving streams.

The plant discharges into a tributary of the Ohio River, which flows into the Mississippi River and ultimately the Gulf of Mexico. The Ohio River watershed supports diverse aquatic life and provides drinking water for millions. Advanced treatment at this plant helps reduce nutrient loading, which is critical for preventing eutrophication in downstream water bodies and the Gulf of Mexico's hypoxic zone.