Geological, geochemical and geophysical techniques were applied for the purposes of determining the presence and concentration of heavy metals in streams sediments of La Plata region. These streams, passing through the town, have been tuned in its vast majority, but in low areas as on the coastal plain they run in open channels.With the population and urban growth, water courses are also recipients of urban, industrial and agricultural wastes. We interpret that clay minerals of the sediments of the streams retain more easily (adsorption) pollutants than sediments of coarse grain size. From this assumption a research trying to establish the relationship between the parameters used, heavy metals and variation of the organic matter was performed. The concentration of total iron oxides was also taken into account considering that iron oxides and oxyhydroxides assist in the process of adsorption of contaminants in association with smectite clays. The area of study is located between 34º 50´- 35º 2´ Lat. S and 57º 45´- 58º 5´ Long. W.