WILEY STP Wastewater Treatment Plant, Prowers County, Colorado

WILEY STP is a municipal wastewater treatment plant located in Prowers County, Colorado, United States. The plant serves a small population of 483 residents, reflecting its role in a rural community. It operates under the regulatory framework of the US Clean Water Act, which requires secondary treatment as a minimum standard for municipal wastewater facilities. The plant provides secondary treatment, which typically involves biological processes to remove organic matter and suspended solids. It has a designed capacity of 283.91 megaliters and an annual discharge volume of 151.42 megaliters, indicating it operates below its full capacity. As a small facility, it is subject to state-level NPDES permits issued by the Colorado Department of Public Health and Environment. The treated effluent is discharged into local waterways that ultimately drain into the Arkansas River basin. The Arkansas River flows through the Great Plains and eventually joins the Mississippi River, contributing to the Gulf of Mexico watershed. The plant's operations help protect downstream water quality in this agriculturally important region.

The plant discharges into local streams that are part of the Arkansas River watershed. The Arkansas River flows eastward across the Great Plains, providing water for irrigation and supporting diverse aquatic habitats. Downstream, the river joins the Mississippi River, which empties into the Gulf of Mexico. The region's semi-arid climate makes water quality management critical for both ecological health and agricultural use.