Marengo WWTP and Sewer System - Advanced Wastewater Treatment in Marengo, Ohio

Marengo WWTP and Sewer System is a municipal wastewater treatment facility located in Marengo, Ohio, United States. It serves a small population of 297 residents in the rural community of Bennington Township, Morrow County. The plant is part of the local infrastructure managed by the village. The facility provides advanced treatment, which goes beyond secondary treatment to remove nutrients and other pollutants. It has a designed capacity of 143.85 megaliters per year and currently discharges 113.56 megaliters annually. As a US plant, it operates under the Clean Water Act, with National Pollutant Discharge Elimination System (NPDES) permits issued by the Ohio Environmental Protection Agency to regulate effluent quality. The plant's treated effluent is discharged into a local waterway that drains into the Scioto River basin, ultimately reaching the Ohio River and then the Mississippi River. This contributes to the water quality of downstream ecosystems, including the Gulf of Mexico. Advanced treatment helps protect local streams from nutrient pollution, supporting aquatic life and recreational uses.

The plant discharges into a tributary of the Scioto River, which flows into the Ohio River and then the Mississippi River, eventually reaching the Gulf of Mexico. The local watershed supports diverse aquatic habitats and is important for regional biodiversity. Advanced treatment at this facility helps reduce nutrient loading, which is critical for preventing downstream eutrophication and maintaining water quality in the Gulf of Mexico's hypoxic zone.