Union City WWT - Secondary Wastewater Treatment Plant in Union City, Oklahoma

Union City WWT is a municipal wastewater treatment facility located in Union City, Canadian County, Oklahoma. The plant serves a small population of around 1,000 residents, providing essential sanitation services for this rural community in the central United States. The facility provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal plants. With a designed capacity of 757.08 megaliters and an annual discharge volume of 529.96 megaliters, the plant operates well within its capacity. As a small agglomeration, it is subject to EPA National Pollutant Discharge Elimination System (NPDES) permitting, which sets effluent limits to protect water quality. The treated effluent is discharged into local waterways that ultimately drain into the Canadian River, a tributary of the Arkansas River system. This river network flows through the Southern Plains and contributes to the Mississippi River Basin, supporting diverse aquatic habitats and agricultural water supplies downstream.

The plant discharges into local streams that feed the Canadian River, which flows through central Oklahoma and joins the Arkansas River near Muskogee. This river system supports a variety of fish species and provides water for irrigation and municipal use. The downstream environment includes the Arkansas River Valley, which is an important migratory corridor for birds and supports riparian ecosystems. Protecting water quality in this basin is critical for maintaining aquatic biodiversity and ensuring safe water for downstream communities.