ST MARYS WWTP - St. Marys, West Virginia Wastewater Treatment Plant

ST MARYS WWTP is a municipal wastewater treatment facility located in St. Marys, Pleasants County, West Virginia, United States. The plant serves a population of approximately 2,892 residents, providing essential sanitation services to this small community along the Ohio River region. The plant operates at the secondary treatment level, which is the standard required by the US Clean Water Act for municipal wastewater facilities. With a designed capacity of 1,135.62 volume units and a current discharge volume of 851.72 volume units, the plant operates within its capacity. As a US facility, it is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent from ST MARYS WWTP is discharged into the local watershed, which ultimately drains to 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. The plant's secondary treatment helps reduce organic pollutants and suspended solids, contributing to the ecological health of this important river system.

The plant discharges into the Ohio River basin, which flows into the Mississippi River and eventually the Gulf of Mexico. The Ohio River is a vital freshwater resource supporting diverse fish populations and migratory birds. Downstream ecosystems include wetlands and floodplains that provide natural water filtration and habitat. The plant's secondary treatment helps maintain water quality in this ecologically significant river system.