Stillwater WWT - Municipal Wastewater Treatment in Stillwater, Oklahoma

Stillwater WWT is a municipal wastewater treatment facility located in Stillwater, Payne County, Oklahoma. Serving an estimated population of 59,065, the plant plays a key role in managing wastewater for this growing city in the central United States. As a facility in the United States, Stillwater WWT operates under the Clean Water Act, administered by the Oklahoma Department of Environmental Quality. Plants of this scale typically employ secondary or advanced treatment processes to meet National Pollutant Discharge Elimination System (NPDES) permit requirements, ensuring compliance with federal and state water quality standards. The plant's treated effluent is discharged into local streams that flow into the Cimarron River, a tributary of the Arkansas River, which ultimately drains into the Mississippi River and the Gulf of Mexico. This downstream connection underscores the plant's role in protecting aquatic ecosystems and downstream water resources.

The plant discharges into tributaries of the Cimarron River, which flows through the Arkansas River basin to the Mississippi River and the Gulf of Mexico. This watershed supports diverse aquatic life and provides habitat for fish and migratory birds. The region's semi-arid climate makes water quality management critical for maintaining ecological balance and supporting agricultural and municipal water uses downstream.