Saint Marys WWTP and Sewer System - Ohio Municipal Wastewater Treatment

The Saint Marys WWTP and Sewer System is a municipal wastewater treatment facility located in Saint Marys, Ohio, serving a population of about 11,584. The plant is situated in Auglaize County and is part of the region's essential water management infrastructure. As a facility serving a medium-sized agglomeration, the plant operates under the U.S. Clean Water Act, which requires secondary treatment as a baseline for municipal wastewater plants. The National Pollutant Discharge Elimination System (NPDES) permit program governs its discharge, ensuring compliance with water quality standards set by the Ohio Environmental Protection Agency. The plant's treated effluent is discharged into local waterways that ultimately drain into the Ohio River basin. The receiving water body supports aquatic life and is part of the larger Mississippi River watershed, which flows into the Gulf of Mexico. Proper treatment helps protect downstream ecosystems and recreational water uses.

The plant discharges into local streams that are part of the Ohio River basin, which flows into the Mississippi River and eventually the Gulf of Mexico. The watershed supports diverse aquatic species and is used for recreation and drinking water supply downstream. Effective wastewater treatment is critical to prevent nutrient pollution and protect water quality in this ecologically important river system.