ST JOHN WWTP - Stafford County, Kansas Wastewater Treatment Plant

ST JOHN WWTP is a municipal wastewater treatment facility located in Stafford County, Kansas, United States. The plant serves a population of approximately 1,200 residents, operating as a secondary treatment facility under the regulatory framework of the US Clean Water Act. As a small-scale plant in a rural inland setting, it plays a key role in local sanitation and water quality management. The plant employs secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 772.22 thousand cubic meters per year and an actual discharge volume of 499.67 thousand cubic meters, the facility operates below its capacity, indicating room for future growth or seasonal variability. US plants of this scale are typically permitted under the National Pollutant Discharge Elimination System (NPDES), administered by the Kansas Department of Health and Environment, ensuring compliance with effluent limits. The treated effluent is discharged into local waterways that drain into the Arkansas River basin, ultimately contributing to the Mississippi River system and the Gulf of Mexico. The plant's operations help protect downstream aquatic habitats and support regional water quality goals in the Great Plains region.

The plant discharges into local streams that flow into the Arkansas River, a major tributary of the Mississippi River system. The Arkansas River supports diverse aquatic life and provides water for irrigation and recreation in the semi-arid Great Plains. Downstream, the river joins the Mississippi and empties into the Gulf of Mexico, where nutrient loading from upstream sources can contribute to hypoxic zones. The plant's secondary treatment helps reduce organic pollutants and nutrients, mitigating impacts on this extensive watershed.