Calion WWTP - Advanced Wastewater Treatment in Union County, Arkansas

Calion WWTP is an advanced wastewater treatment plant located in Union County, Arkansas, United States. The facility serves a small population of 494 residents, reflecting its role in a rural community. As a municipal plant, it is part of the state's wastewater infrastructure managed under the Clean Water Act. The plant employs advanced treatment processes, which go beyond secondary treatment to remove nutrients and other pollutants. Its designed capacity of 423.96 units indicates headroom for future growth, while current discharge volume is 143.85 units. Under the U.S. EPA's National Pollutant Discharge Elimination System (NPDES), plants of this scale are typically permitted by the Arkansas Department of Energy and Environment - Division of Environmental Quality. The treated effluent is discharged into a local water body, likely a tributary of the Ouachita River basin, which flows south to the Mississippi River and ultimately the Gulf of Mexico. The plant's advanced treatment helps protect downstream aquatic ecosystems and supports water quality in the region.

The plant discharges into a local water body within the Ouachita River basin, which drains into the Mississippi River and then the Gulf of Mexico. This watershed supports diverse aquatic life, including fish and invertebrates, and is important for regional biodiversity. Advanced treatment reduces nutrient loading, helping to prevent eutrophication in downstream waters.