FORISTELL WWTP - Secondary Treatment Plant in Foristell, Missouri

FORISTELL WWTP is a municipal wastewater treatment facility located in Foristell, Missouri, within Saint Charles County. The plant serves a small population of 505 residents, reflecting the rural character of the area. It operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment for municipal discharges. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 567.81 units and an actual discharge volume of 56.78 units, the facility operates well below its capacity, indicating room for future growth. As a small-scale plant, it is subject to state-level NPDES permits that set effluent limits to protect water quality. The treated effluent is discharged into local waterways that ultimately drain into the Mississippi River basin. This region supports diverse aquatic life and is part of a larger watershed that flows to the Gulf of Mexico. The plant's operations help maintain water quality in the local streams and contribute to the ecological health of the downstream environment.

The plant discharges into a local stream that is part of the Mississippi River watershed. This basin drains a vast agricultural and urban area before reaching the Gulf of Mexico. The receiving waters support fish and wildlife, and the plant's secondary treatment helps reduce nutrient loads that could contribute to downstream hypoxia zones.