WEIR POTW - Secondary Wastewater Treatment Plant in Weir, Mississippi

WEIR POTW is a publicly owned treatment works serving the town of Weir in Choctaw County, Mississippi. The plant provides secondary treatment for a population of 525, operating as part of the municipal wastewater infrastructure for this rural community in the southeastern United States. The plant treats an average daily flow of 189.27 cubic meters against a designed capacity of 378.54 cubic meters, indicating operational headroom. As a secondary treatment facility, it meets the standard requirements under the U.S. Clean Water Act, which mandates secondary treatment for municipal wastewater discharges to surface waters. The plant is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program administered by the Mississippi Department of Environmental Quality. The treated effluent is discharged to a receiving water body that ultimately drains into the Tombigbee River basin, part of the larger Mobile River system that flows into the Gulf of Mexico. The plant's location inland, over 50 kilometers from the coast, reduces direct marine impact, but its discharge contributes to the water quality of local streams and the downstream aquatic ecosystem.

The plant discharges into a local waterway that is part of the Tombigbee River watershed, which flows southward to join the Alabama River and form the Mobile River, emptying into Mobile Bay and the Gulf of Mexico. This region supports diverse aquatic life, including fish species such as bass and catfish, and the watershed provides important habitat for migratory birds. The secondary treatment process helps reduce organic pollutants and suspended solids, protecting the ecological health of the receiving stream and downstream environments.