Neosho Rapids WWTP - Secondary Treatment Plant in Lyon County, Kansas

Neosho Rapids WWTP is a municipal wastewater treatment facility located in Lyon County, Kansas, United States. The plant serves a small community of 266 residents, reflecting its role in rural wastewater management. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 170.34 units and an average discharge of 102.21 units, it operates below its maximum capacity. Under the US Clean Water Act, such facilities are regulated through the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent is discharged into a local waterway that ultimately drains into the Neosho River basin, part of the larger Arkansas River watershed. This system supports regional aquatic life and agricultural water use, making proper treatment essential for downstream ecosystem health.

The plant discharges into a tributary of the Neosho River, which flows through eastern Kansas into the Arkansas River and eventually the Mississippi River. The Neosho River basin supports diverse aquatic species and provides water for irrigation and recreation. Maintaining secondary treatment standards helps protect this watershed from nutrient pollution and oxygen depletion.