Union Lagoon Wastewater Treatment Plant - Union, Missouri, USA

Union Lagoon is a wastewater treatment facility located in Union, Franklin County, Missouri, United States. The plant serves a population of about 9,504 residents, making it a medium-sized agglomeration under US EPA guidelines. It operates within the Mississippi River Basin, contributing to regional water quality management. As a US facility, Union Lagoon is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting, administered by the Missouri Department of Natural Resources. The plant's treated effluent ultimately drains into the Missouri River system, which flows into the Mississippi River and then to the Gulf of Mexico. This downstream pathway supports diverse aquatic life and is an important corridor for migratory fish species. The plant's operations play a role in protecting water quality in the region's rivers and streams.

Union Lagoon discharges into local tributaries that feed into the Missouri River, a major tributary of the Mississippi River. The Mississippi River Basin supports a wide range of aquatic ecosystems and is a critical migratory route for birds and fish. The plant's location inland, over 50 km from the coast, means its discharge primarily affects freshwater environments rather than marine systems.