Manchester WWT Wastewater Treatment Plant, Grant County, Oklahoma

Manchester WWT is a municipal wastewater treatment facility located in Grant County, Oklahoma, serving a small population of 104 residents. The plant provides secondary treatment, a standard level for small communities in the United States. The plant has a designed capacity of 37.85 units and discharges a similar volume of treated effluent. As a US facility, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Oklahoma Department of Environmental Quality, ensuring compliance with water quality standards. The treated wastewater is discharged into local waterways that drain into the Arkansas River basin, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant plays a role in protecting downstream water quality in this agriculturally intensive region.

The plant discharges into local streams within the Arkansas River watershed, which flows into the Mississippi River and then the Gulf of Mexico. The surrounding area is primarily agricultural, so the plant helps reduce nutrient and pathogen loads that could impact downstream aquatic ecosystems and drinking water sources.