Ashville Lagoon Wastewater Treatment Plant, Ashville, Alabama

Ashville Lagoon is a municipal wastewater treatment facility located on Double Bridge Road in Ashville, St. Clair County, Alabama. The plant serves a small population of approximately 1,200 residents, reflecting its role in a rural community. As a lagoon-based system, it provides secondary treatment, which is typical for small agglomerations in the region. The plant has a designed capacity of 1,362.74 volume units and discharges an average of 397.47 volume units, indicating a utilization rate well below capacity. Under the US Clean Water Act, such facilities operate under National Pollutant Discharge Elimination System (NPDES) permits issued by the Alabama Department of Environmental Management, which set effluent limits to protect water quality. The treated effluent from Ashville Lagoon ultimately drains into the Coosa River basin, part of the larger Mobile River system that flows into the Gulf of Mexico. This watershed supports diverse aquatic life and is important for regional water supply and recreation. The plant's operations help maintain the ecological health of local streams and downstream environments.

Ashville Lagoon discharges into tributaries of the Coosa River, which flows into the Alabama River and eventually the Mobile River delta and the Gulf of Mexico. This watershed supports diverse aquatic species, including several endemic fish and mussel species. The plant's secondary treatment helps reduce nutrient and organic loads, protecting downstream water quality in this ecologically sensitive region.