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Toxic compounds are frequently found in discharges (industrial and domestic effluents) with very variable biodegradability. Among those that are feared for the ecosystem are phenols. Phenol and its derivatives are considered by the Environmental Protection Agency as important pollutants. The objective of this study is the determination of the level phenol of the waters of the Ebrié lagoon. The water samples were collected in five bays of the Ebrié lagoon namely; Koumassi, Vridi, Plateau, Cocody, and Bingerville. The phenol values found for samples taken from the water range from 0.11 to 9.493 mg / L, exceeding the allowable standards. Pre-discharge purification is therefore essential given the toxicity of this type of compounds.