BELLERAGUEB, FatimaELMEGBED, Nour El Houda2025-10-272025-10-272025https://dspace.univ-ghardaia.edu.dz/xmlui/handle/123456789/10021This study aims to assess the quality of raw and treated wastewater in the El Meniaa province by comparing it to national (JORA) and international ( OMS) standards. Physico-chemical and bacteriological analyses were conducted over a five-month period (January to May) on domestic effluents treated by a natural lagoon-based biological treatment plant serving the municipalities of Meniaa and Hassi El Gara. The results indicate compliance with parameters such as temperature, pH, nitrites, nitrates, and phosphorus. However, BOD₅ (39 mg/L) and suspended solids (42.8 mg/L) exceed the permissible limits. Removal efficiencies reached 53.4% for BOD₅, 47.5% for COD, 53% for suspended solids, and over 98% for coliforms. These findings suggest partial treatment effectiveness, highlighting the need for further improvements to ensure compliant discharge and support the sustainable reuse of treated wastewater.frStation d’épuration, Eaux usées, Qualité, wilaya de El Meniaa.Wastewater treatment plant, Wastewater, Quality, Province El Meniaa