Mullinville WWTP - Secondary Treatment Plant in Mullinville, Kansas

Mullinville WWTP is a municipal wastewater treatment facility located in Mullinville, Kansas, serving a small population of 257 residents. The plant operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal wastewater discharges. As a small agglomeration, the plant is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Kansas Department of Health and Environment. The plant provides secondary treatment, which typically involves biological processes to remove organic matter and suspended solids. With a designed capacity of 189.27 million gallons per year and an actual discharge volume of 105.99 million gallons per year, the facility operates well within its capacity. The treatment process meets federal and state standards for protecting water quality. The treated effluent is discharged into local streams that drain into the Arkansas River basin, ultimately flowing to the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting the region's water resources by reducing pollutant loads before discharge, supporting aquatic life and downstream water quality in the Great Plains ecosystem.

The plant discharges into small tributaries of the Arkansas River, which flows through Kansas and Oklahoma before joining the Mississippi River. The Arkansas River basin supports diverse aquatic habitats and is an important water source for agriculture and communities. The plant's secondary treatment helps reduce nutrient and organic pollution, protecting the ecological health of the downstream river system and the Gulf of Mexico.