Valle Lake Sewer District Wastewater Treatment Plant, Valles Mines, Missouri

Valle Lake Sewer District is a municipal wastewater treatment facility located in Valles Mines, Missouri, within Jefferson County. The plant serves a small population of 200 residents, reflecting its role in a rural community. It operates under the regulatory framework of the United States Clean Water Act, which governs wastewater discharges through the National Pollutant Discharge Elimination System (NPDES) permit program. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. Its designed capacity is 757.08 megaliters per year, with an actual discharge volume of 75.71 megaliters annually, indicating significant spare capacity. As a small facility, it is subject to state-level oversight by the Missouri Department of Natural Resources, which issues permits to ensure compliance with water quality standards. The treated effluent is discharged into a local waterway that ultimately drains into the Mississippi River basin. The plant's location inland, over 50 kilometers from the coast, reduces direct marine impact. Its operations help protect downstream aquatic ecosystems, including streams and rivers that support diverse fish and invertebrate populations.

The plant discharges into a tributary of the Mississippi River system, which flows into the Gulf of Mexico. This watershed supports a variety of aquatic life and is part of a larger drainage basin that includes agricultural and forested areas. The plant's secondary treatment helps reduce nutrient and pollutant loads, mitigating potential impacts on downstream water quality and the hypoxic zone in the Gulf.