Grayson WWT Wastewater Treatment Plant, Grayson, Oklahoma

Grayson WWT is a municipal wastewater treatment facility located in Grayson, Okmulgee County, Oklahoma. It serves a small population of 159 residents, reflecting the rural character of the area. The plant is situated inland, far from coastal zones, and operates under the regulatory framework of the United States Clean Water Act. The plant provides secondary treatment, which is the standard level required by the Clean Water Act for municipal wastewater facilities. With a designed capacity of 64.35 volume units and a corresponding discharge volume, the plant is sized appropriately for its small service population. As a US facility, it operates under an EPA National Pollutant Discharge Elimination System (NPDES) permit issued by the Oklahoma Department of Environmental Quality, ensuring compliance with effluent limits. The treated effluent is discharged into local streams that are part of the Arkansas River watershed, ultimately draining into the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting water quality in this inland basin, supporting aquatic life and downstream uses.

The plant discharges into small tributaries of the Arkansas River basin, which flows into the Mississippi River and then the Gulf of Mexico. This inland watershed supports diverse aquatic habitats and is important for regional water quality. The secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream ecosystems.