CALLAO WWTP - Macon County, Missouri Wastewater Treatment Plant

CALLAO WWTP is a municipal wastewater treatment plant located in Macon County, Missouri, along the Chicago-Kansas City Expressway. The plant serves a small population of 292 residents and is part of the region's wastewater infrastructure. As a secondary treatment facility, CALLAO WWTP provides biological treatment to remove organic matter and suspended solids. The plant has a designed capacity of 132.49 volume units and currently processes 98.42 volume units, indicating it operates below capacity. Under the U.S. Clean Water Act, such facilities must comply with National Pollutant Discharge Elimination System (NPDES) permits issued by the Missouri Department of Natural Resources, which set effluent limits to protect water quality. The plant's treated effluent discharges into local streams that ultimately flow into the Missouri River watershed. This river system supports diverse aquatic life and provides drinking water for downstream communities. Proper treatment at CALLAO WWTP helps maintain the ecological health of these waterways.

CALLAO WWTP discharges into local tributaries of the Missouri River, which flows into the Mississippi River and eventually the Gulf of Mexico. The Missouri River watershed supports a variety of fish species and migratory birds. The plant's secondary treatment helps reduce nutrient loads that could contribute to downstream hypoxia in the Gulf.