STEP ZAGHOUAN Wastewater Treatment Plant, Zaghouan, Tunisia

STEP ZAGHOUAN is a wastewater treatment plant located in the Zaghouan Governorate of Tunisia, serving the local population and industrial areas. As an operational facility, it is part of Tunisia's national wastewater infrastructure managed by the National Sanitation Utility (ONAS). The plant contributes to public health and environmental protection by treating wastewater before discharge. Tunisia's wastewater treatment sector operates under Law No. 75-16 on water and the National Sanitation Strategy. Plants like STEP ZAGHOUAN are expected to meet secondary treatment standards as a minimum, with larger agglomerations requiring advanced treatment to protect sensitive water bodies. The plant's treatment processes and capacity align with national regulations aimed at reducing pollution loads. The treated effluent from STEP ZAGHOUAN is discharged into local wadis that eventually flow into the Mediterranean Sea via the Gulf of Tunis. This watershed supports agricultural activities and natural habitats. Proper treatment is essential to prevent eutrophication and protect downstream ecosystems, including coastal waters that are important for tourism and fisheries.

STEP ZAGHOUAN discharges into the local wadi system, which drains into the Mediterranean Sea via the Gulf of Tunis. The region's semi-arid climate means water resources are scarce, making treated wastewater valuable for irrigation. Protecting downstream coastal waters from nutrient pollution is critical for maintaining marine biodiversity and supporting local communities.