Missouri River WWTP - Maryland Heights, Missouri | Wastewater Treatment Plant

Missouri River WWTP is a municipal wastewater treatment facility located in Maryland Heights, Missouri, serving a population of about 180,000. The plant is situated along the Katy Trail and plays a key role in managing wastewater for the St. Louis metropolitan area. As a large agglomeration serving over 150,000 people, the plant operates under the U. S. Clean Water Act, which requires secondary treatment as a minimum standard. The National Pollutant Discharge Elimination System (NPDES) permit program governs its discharge, ensuring compliance with water quality standards for the receiving water body. The plant discharges treated effluent into the Missouri River, which flows into the Mississippi River and ultimately to the Gulf of Mexico. This river system supports diverse aquatic life and is an important migratory corridor for fish and birds. The plant's operations help protect downstream water quality and ecosystem health.

The Missouri River WWTP discharges into the Missouri River, a major tributary of the Mississippi River. The river flows through the central United States, draining into the Gulf of Mexico. The watershed supports diverse aquatic habitats and is critical for migratory species. The plant's discharge contributes to the overall nutrient load in the Mississippi River basin, which has implications for the Gulf of Mexico hypoxic zone.