RESUMEAu Sénégal, les eaux usées domestiques et industrielles sont versées directement dans le milieu aquatique sans aucun traitement préalable, pouvant créer une dégradation du milieu marin. Dans le présent travail, nous avons déterminé les paramètres physico-chimiques et métalliques des eaux usées du canal Est, qui débouche sur la baie de Hann, pour vérifier les normes de rejets avant le déversement dans le milieu récepteur. Le canal, situé le long de la côte dakaroise, a été choisi à cause des nombreuses activités qui se déroulent sur la baie de Hann. Physico-chemical characterization and metallic contamination of wastewater discharged at Hann Bay (Dakar / Senegal) ABSTRACT In Senegal, domestic and industrial worn water is directly versed in the aquatic environment without any preliminary treatment. That can have as a consequence the degradation of the marine environment. In this work, we characterized some physicochemical and metal parameters the water used before discharge in the receiving medium to check their standards of rejections. For that, the channel of bay of Hann was selected along the coast dakaroise because of many activities which proceed there. The physical parameters (pH, temperature and conductivity) were measured in situ using an apparatus HANNA instruments pH/conductivity HI 98129. The chemical and metal parameters (ammonium, chromium 6, chloride, fluoride, potassium, nitrate, I. DIAGNE et al. / Int. J. Biol. Chem. Sci. 11(1): 462-472, 2017 463 phosphate and sulphate) were proportioned by a photometer PF-11.The results obtained show that the studied physical parameters do not exceed the standards of water discharges used in this receiving medium. NO 3 -is not detected on the level of worn water samples the taken whereas contents of the Cr 6+ elements + , SO 4 2-, F -, Cl -are lower than the limit of forward thrusts in the receiving medium. However the concentrations recorded out of NH4 + , K + and PO 4 3-are definitely higher than the standard set by the legislation of rejections in the receiving medium. Consequently, the discharge of this water used in this aquatic environment can lead to eutrophication and rarefaction or the death of fish.