Wathena WWTP - Secondary Treatment Plant in Doniphan County, Kansas

Wathena WWTP is a municipal wastewater treatment plant located in Doniphan County, Kansas, serving a population of approximately 1,344 residents. The facility is situated near the Missouri River, which ultimately drains into the Mississippi River and the Gulf of Mexico. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids from domestic wastewater. The plant has a designed capacity of 730.58 thousand cubic meters per year and currently handles an average discharge volume of 507.25 thousand cubic meters annually. Under the US Clean Water Act, facilities of this scale are typically regulated through National Pollutant Discharge Elimination System (NPDES) permits issued by the Kansas Department of Health and Environment. These permits set effluent limits to protect water quality in the receiving water body. The treated effluent from Wathena WWTP is discharged into local waterways that feed into the Missouri River, a major tributary of the Mississippi River system. The plant plays a critical role in protecting downstream aquatic ecosystems and maintaining water quality for communities along the river corridor. Its secondary treatment process helps reduce nutrient loading and organic pollution, supporting the ecological health of the region's waterways.

The plant discharges into the Missouri River watershed, which flows into the Mississippi River and ultimately the Gulf of Mexico. This river system supports diverse aquatic life, including fish species such as catfish and sturgeon, and provides habitat for migratory birds. The watershed is also a critical corridor for nutrient transport, making effective wastewater treatment essential to mitigate downstream eutrophication and hypoxia in the Gulf.