Our study aimed to analyze the perceptions of riparian households related to the causes and consequences of the pollution of the Koumassi Ebrié lagoon. It is based on the mixed approach combining quantitative and qualitative method, using documentary research, direct field observations, the survey by questionnaire, semi-directive individual interviews and Focus Group. The results obtained first show the socio-demographic profile of households. For this purpose, the average household size is 6 people. In addition, households operate such as fishing, lagoon transport, selling fish products, fish smoking. In addition, the average income of households is between 10,000 and 50,000 FCFA. The causes mentioned by households, at the origin of the pollution of the Ebrié Lagoon of Koumassi are: (1) household waste spills and domestic wastewater from activities, at the same time, riparian and abidjanese populations, directly In the lagoon, (2) wastewater spills from the activities of the industries installed near the lagoon and (3) the use of toxic products (pesticides) by certain fishermen for their activity (fishing). Finally, the results of the study show that the pollution of the Koumassi Ebrié lagoon impact the fishery resources, the environment and habitats of respondents. Also the study reveals the impact of pollution on health, food, rituals and household leisure.