West Harrison Water and Sewer Dist - Advanced Wastewater Treatment in De Lisle, Mississippi

West Harrison Water and Sewer Dist is a municipal wastewater treatment facility located at 7399 Lobouy Road in De Lisle, Harrison County, Mississippi. Serving a population of approximately 1,792, the plant provides advanced treatment for the local community. As a coastal facility within 10 km of the Gulf of Mexico, it plays a critical role in protecting nearby marine and estuarine environments. The plant operates under the U.S. Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. With an advanced treatment level, the facility exceeds the secondary treatment standard typically mandated for municipal plants. The designed capacity of 757.08 thousand cubic meters per year matches the reported discharge volume, indicating consistent operation at full capacity. The treated effluent is discharged into local waterways that drain into the Mississippi Sound and ultimately the Gulf of Mexico. This coastal region supports diverse aquatic life, including shellfish and finfish, and is an important migratory corridor for birds. The plant's advanced treatment helps minimize nutrient loading and protect water quality in this ecologically sensitive area.

The plant discharges into tributaries of the Mississippi Sound, a shallow estuary along the northern Gulf of Mexico. This water body supports oyster reefs, seagrass beds, and critical habitat for marine species. The Gulf of Mexico receives the outflow, and the region is subject to seasonal hypoxia concerns, making nutrient removal from advanced treatment particularly valuable.