The industrial waste deposits determine an increased pollution of underground waters. The paper presents the modeling of pollution phenomenon of underground water in an industrial waste deposit area. The pollution phenomenon is analyzed in time, during the period of the deposit exploitation and conservation. The results obtained through modeling allow the application of some environment protection measures. The numerical simulations achieved for different scenarios and for a certain period of time can appreciate the dispersion of a pollutant in a carrier of water. The numerical simulation used the FEFLOW program package. The simulation model through the FEFLOW program package has allowed the analysis and the methods of underground waters depollution for a certain determined period of time.