The technological procedure by which the urban residual deposits are being processed presents an obvious impact upon the quality of the environment. Through the process of infiltration the domestic residual deposits can negatively affect the quality of the subsurface waters. The presence of precipitations depends on the climatic conditions and together with a raised degree of permeability of the deposits; it contributes to the polluting of the subsurface waters, emphasized by the values of the chemical content of oxygen expressed by CCOCr and CB05.