The anthropic impact activities on the water quality of the Oubeira lagoon, trace elements of the water and sediments were investigated. Sediment samplings points in the Oubeira lagoon were analyzed in order to determine the trace elements of some metals like iron (Fe), copper (Cu), zinc (Zn), chromium (Cr), nickel (Ni), lead (Pb) and cadmium (Cd). The sampling was occurred in two different stations of the lagoon in seasonal manner; and was established by a 4 taking away campaigns of surface sediments, during a year between 2007/2008. The evaluation of the contamination metal level of the sediments was carried out using the application of the index of contamination (I c). The variation space-time of the content in different metals reveals the presence of a contamination dominated by the iron. Therefore, the transposition problem of this contamination towards the embouchures and to its immediate environment remains unclear by considering certain natural phenomena such as the big rains and maregraphic dynamics.