FOYIL WWT Wastewater Treatment Plant, Foyil, Oklahoma

FOYIL WWT is a municipal wastewater treatment facility located in Foyil, Oklahoma, a small town in Rogers County. The plant serves a population of approximately 300 residents, reflecting its role as a small-scale community infrastructure. It is situated inland, away from coastal influences, and its operations are governed by state and federal environmental regulations. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 109.78 megaliters and an annual discharge volume of 75.71 megaliters, the facility operates well within its capacity. As a US plant, it is subject to the Clean Water Act and typically requires an NPDES permit issued by the Oklahoma Department of Environmental Quality, ensuring compliance with effluent limits. The treated wastewater is discharged into local waterways that eventually drain into the Verdigris River basin, part of the larger Arkansas River watershed. This system flows into the Mississippi River and ultimately the Gulf of Mexico. The plant's operations help protect downstream aquatic habitats and water quality in the region.

FOYIL WWT discharges into the Verdigris River basin, which flows into the Arkansas River and then the Mississippi River, reaching the Gulf of Mexico. The local watershed supports diverse aquatic life and is an important migratory corridor for birds. The plant's secondary treatment reduces organic pollutants, safeguarding water quality in this inland river system.