Missouri Valley STP - Secondary Wastewater Treatment Plant in Missouri Valley, Iowa

Missouri Valley STP is a municipal wastewater treatment facility located in Missouri Valley, Harrison County, Iowa. The plant serves a population of about 2,838 residents and operates under the regulatory framework of the United States Clean Water Act, which requires secondary treatment for municipal wastewater discharges. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 1,627.72 thousand cubic meters per year and an actual discharge volume of 757.08 thousand cubic meters, the facility operates below its capacity, indicating room for future growth. As an inland plant, it does not discharge directly to coastal waters. The treated effluent is discharged into local waterways that flow through the Missouri River basin, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting water quality in the region, supporting aquatic life and downstream ecosystems.

The plant discharges into the Missouri River watershed, which drains into the Mississippi River and eventually the Gulf of Mexico. This inland location supports diverse aquatic habitats and is important for migratory fish species. The secondary treatment process helps reduce nutrient loading, which is critical for preventing hypoxia in the Gulf of Mexico.