South 641 WD HAZEL Wastewater Treatment Plant, Calloway County, Kentucky

South 641 WD HAZEL is a wastewater treatment plant located on State Line Road East in Calloway County, Kentucky, United States. It serves a small population of 460 residents, reflecting its role in a rural or suburban community. The plant's designed capacity is 185.48 volume units, with a current discharge volume of 113.56 volume units. The plant provides secondary treatment, a standard level required under the US Clean Water Act for municipal wastewater. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's operations are subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Kentucky Division of Water, ensuring compliance with federal water quality standards. The treated effluent is discharged into local waterways that drain into the Mississippi River basin, ultimately reaching the Gulf of Mexico. This connection underscores the plant's role in protecting downstream aquatic ecosystems and contributing to the overall health of the Mississippi River watershed. The plant's location more than 10 km from the coast reduces direct marine impact, but its discharge still influences regional water quality.

The plant discharges into local streams that are part of the Mississippi River basin, which flows into the Gulf of Mexico. This watershed supports diverse aquatic life and is an important migratory corridor for fish and birds. The secondary treatment helps reduce nutrient and pollutant loads, mitigating eutrophication risks in downstream waters.