Calhoun WWTP - Secondary Wastewater Treatment in Calhoun, Missouri

Calhoun WWTP is a municipal wastewater treatment facility located on East Main Street in Calhoun, Henry County, Missouri. The plant serves a small population of 469 residents, reflecting the rural character of the area. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids from wastewater. The plant operates under the regulatory framework of the U.S. Clean Water Act, administered by the Missouri Department of Natural Resources. For small communities like Calhoun, secondary treatment is the standard requirement to meet water quality standards. The plant has a designed capacity of 189.27 megaliters, with an actual discharge volume of 132.49 megaliters, indicating it operates below its full capacity. The treated effluent is discharged into a local waterway that eventually drains into the Missouri River watershed. The Missouri River flows eastward to join the Mississippi River, which empties into the Gulf of Mexico. The plant's operations help protect downstream aquatic habitats and maintain water quality in the region's surface waters.

The treated effluent from Calhoun WWTP enters a small tributary within the Missouri River basin. The Missouri River flows through the central United States, supporting diverse aquatic life and providing habitat for fish species such as catfish and paddlefish. Downstream, the river joins the Mississippi River, which discharges into the Gulf of Mexico, a large marine ecosystem. The plant's secondary treatment helps reduce nutrient loads that could contribute to hypoxia in the Gulf.