ADAIR WWT Wastewater Treatment Plant, Mayes County, Oklahoma

ADAIR WWT is a municipal wastewater treatment facility located in Mayes County, Oklahoma, United States. The plant serves a small population of 810 residents, reflecting its role in a rural or small community setting within the state. The facility provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 359.61 units and an average discharge volume of 264.98 units, the plant operates below its maximum capacity. Under the U.S. Clean Water Act, such facilities are regulated through National Pollutant Discharge Elimination System (NPDES) permits, which set effluent limits to protect water quality. The treated effluent is discharged into a local water body, contributing to the watershed that ultimately drains into the Arkansas River system and the Mississippi River basin. This downstream connection highlights the plant's role in maintaining water quality in a region characterized by agricultural and rural landscapes.

The plant discharges into a local water body within the Arkansas River watershed, which flows through Oklahoma and Arkansas before joining the Mississippi River. This region supports diverse aquatic life and is important for migratory birds. The secondary treatment process reduces organic pollutants, helping to protect downstream ecosystems from nutrient enrichment and oxygen depletion.