Kilmichael POTW - Secondary Wastewater Treatment Plant in Kilmichael, Mississippi

Kilmichael POTW is a municipal wastewater treatment plant located on School Road in Kilmichael, Montgomery County, Mississippi. The facility serves a small population of 830 people, reflecting the rural character of the area. As a publicly owned treatment works (POTW), it is part of the national infrastructure managed under the US Clean Water Act. The plant provides secondary treatment, which is the standard level required by the US EPA for municipal wastewater facilities. With a designed capacity of 681.37 thousand gallons per day and an average daily flow of 450.46 thousand gallons per day, the plant operates below its capacity, indicating adequate headroom for current demand. Secondary treatment typically involves biological processes such as activated sludge or trickling filters. The treated effluent is discharged into local waterways that drain into the Big Black River basin, ultimately reaching the Mississippi River and the Gulf of Mexico. The plant's inland location, over 50 km from the coast, reduces direct marine impact. Its operation helps protect downstream water quality in a region dominated by agriculture and forestry.

The plant discharges into tributaries of the Big Black River, which flows southwest through Mississippi to join the Mississippi River near Grand Gulf. The Mississippi River then empties into the Gulf of Mexico, contributing to the vast Mississippi River Basin. The receiving waters support diverse aquatic life and are important for regional biodiversity, including fish species such as catfish and bass. The plant's secondary treatment helps reduce nutrient loading, which is critical for mitigating hypoxia in the Gulf of Mexico.