To check the efficiency of operation of treatment plants, the fields of one-time and long-term pollution of the environment in a source effective zone should be studied. In this paper, we use the regression dependence to describe long-term pollution of the environment. Our studies have shown that the reconstruction models adequately describe pollution of soil with chemical elements in a wide range of distances, and the background contents of different chemical elements vary significantly, hence, it is necessary to consider them when estimating the total fall.