CHAMOIS WWTP - Secondary Treatment Plant in Chamois, Missouri

CHAMOIS WWTP is a municipal wastewater treatment facility located in Chamois, Osage County, Missouri. The plant serves a small population of 483 residents, providing secondary treatment to meet Clean Water Act standards. As a small-scale facility, it plays a vital role in protecting local water quality in this rural Midwestern community. The plant operates with secondary treatment, which is the minimum standard required by the US EPA for municipal wastewater facilities. Its designed capacity is 208.20 volume units, with an average daily discharge of 158.99 volume units. Under the National Pollutant Discharge Elimination System (NPDES), the plant must comply with effluent limits set by the Missouri Department of Natural Resources to protect receiving waters. The treated effluent from CHAMOIS WWTP ultimately drains into the Missouri River watershed, which flows into the Mississippi River and then to the Gulf of Mexico. This downstream connection highlights the plant's role in reducing nutrient and pollutant loads that contribute to the Gulf of Mexico hypoxic zone. The facility's secondary treatment helps mitigate local impacts on aquatic life in nearby streams.

The plant discharges into local streams that are part of the Missouri River basin, a major tributary of the Mississippi River. The Missouri River supports diverse aquatic species and provides critical habitat for migratory birds. Downstream, the Mississippi River carries treated effluent to the Gulf of Mexico, where nutrient loading contributes to seasonal hypoxia. The plant's secondary treatment helps reduce local organic and nutrient pollution, supporting the ecological health of the watershed.