Drexel North WWTP - Secondary Treatment Plant in Drexel, Missouri

Drexel North WWTP is a municipal wastewater treatment facility located in Drexel, Missouri, serving a small population of 483 residents. The plant operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment for municipal wastewater discharges to surface waters. As a small-scale facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Missouri Department of Natural Resources, ensuring compliance with water quality standards. The plant provides secondary treatment, a biological process that removes organic matter and suspended solids. Its designed capacity is 189.27 thousand gallons per day, with an actual discharge volume of 170.34 thousand gallons per day, indicating it operates below capacity. Secondary treatment typically involves activated sludge or trickling filter systems, followed by disinfection. The treated effluent is discharged into a local waterway within the Missouri River basin. The plant plays a key role in protecting downstream water quality, including the Missouri River and its tributaries, which support diverse aquatic life and provide drinking water, recreation, and irrigation for communities in the region.

The plant discharges into a tributary of the Missouri River, which flows into the Mississippi River and ultimately the Gulf of Mexico. The local watershed is part of the larger Mississippi River basin, one of the most ecologically significant river systems in North America. The plant's secondary treatment helps reduce nutrient loads that could contribute to hypoxia in the Gulf of Mexico, supporting the health of downstream aquatic ecosystems.