Marietta WWTP and Sewer System - Marietta, Ohio Wastewater Treatment Plant

The Marietta WWTP and Sewer System is a municipal wastewater treatment facility located in Marietta, Ohio, serving a population of around 19,452. Situated in Washington County along the Ohio River, the plant is part of the region's critical water infrastructure. As a medium-sized agglomeration, the facility operates under the U.S. Clean Water Act, which requires secondary treatment as a baseline for municipal wastewater plants. Under the National Pollutant Discharge Elimination System (NPDES), the plant is subject to discharge permits that set limits on pollutants to protect receiving waters. Plants of this scale typically employ biological treatment followed by disinfection. It continues to serve the community's wastewater needs. The plant's treated effluent ultimately reaches the Ohio River, a major tributary of the Mississippi River system. The Ohio River supports diverse aquatic life and provides drinking water for millions downstream. Proper treatment at this facility helps maintain water quality in this ecologically and economically significant waterway.

The plant discharges into the Ohio River, which flows southwest to join the Mississippi River and eventually the Gulf of Mexico. This river system supports a variety of fish species and is an important migratory corridor for birds. The watershed is influenced by agricultural and industrial activities, making effective wastewater treatment essential for maintaining downstream water quality and ecosystem health.