Elk River Sewage Plant | Municipal Wastewater Treatment in Elk River, Minnesota

Elk River Sewage Plant is a municipal wastewater treatment facility located at 204 Railroad Drive Northwest in Elk River, Minnesota. The plant serves a population of about 24,279 people, placing it in the medium-agglomeration category for US wastewater systems. It operates under the regulatory framework of the US Clean Water Act, administered by the Minnesota Pollution Control Agency, which issues National Pollutant Discharge Elimination System (NPDES) permits for facilities of this scale. As a plant serving a community of this size, typical treatment includes secondary biological processes to meet federal and state effluent standards. US regulations require secondary treatment for municipal plants discharging to surface waters. The plant's location inland, over 50 km from the coast, indicates its effluent enters a freshwater system. The plant's discharge ultimately reaches the Mississippi River watershed, as Elk River lies within the Upper Mississippi River Basin. The Mississippi River downstream supports diverse aquatic life and provides drinking water for millions. The facility's performance is critical to maintaining water quality in this major river system and its tributaries.

The plant discharges into the Elk River, a tributary of the Mississippi River. The Mississippi River downstream flows through Minnesota and into the Gulf of Mexico, supporting extensive aquatic ecosystems and serving as a major migratory corridor for birds and fish. The watershed includes agricultural and urban areas, making nutrient management important to prevent downstream hypoxia in the Gulf.