Hannibal WWTP | Municipal Wastewater Treatment in Hannibal, Missouri

Hannibal WWTP is a municipal wastewater treatment facility located in Hannibal, Marion County, Missouri. Serving a population of about 17,907, the plant is part of the city's essential infrastructure for managing domestic and industrial wastewater. As a medium-sized agglomeration, the plant operates under the U.S. Clean Water Act, which requires secondary treatment as a baseline for municipal wastewater plants. The National Pollutant Discharge Elimination System (NPDES) permit program governs its discharge, ensuring compliance with water quality standards set by the Missouri Department of Natural Resources. The plant's treated effluent is discharged into Bear Creek, a tributary that flows into the Mississippi River. The Mississippi River is a major ecological corridor supporting diverse aquatic life and migratory birds. The plant's operations help protect downstream water quality in this nationally significant river system.

Hannibal WWTP discharges into Bear Creek, which flows into the Mississippi River near Hannibal. The Mississippi River is a major North American waterway that drains into the Gulf of Mexico, supporting extensive aquatic habitats and commercial fisheries. The plant's treatment helps reduce nutrient and pollutant loads, contributing to the health of the river ecosystem and mitigating downstream impacts such as hypoxia in the Gulf.