Ellipsometry is an optical technique that uses the change in the state of polarization of light upon reflection and refraction for the in-situ and real-time characterization of surfaces, interfaces, liquid solutions in the hydrochemical investigations. Spectroellipsometry methods are used for the undestroying investigation of chemical and physical characteristics of liquid solutions. The diagnostics of liquids gives possibility to assess the concentration of chemicals dissolved and weighed in the liquid as well as to determine the spots of pollutants on the water surface. A compact measuring — information multi-channel spectroellipsometric system for monitoring the quality of aquatic environment, that is based on the combined use of spectroellipsometry and training, classification, and identification algorithms is described. This system is differed from modern analogues by the use of a new and very promising method of ellipsometric measurements, an original element base of polarization optics and a complex mathematical approach to estimat- ing the quality of a water object subjected to anthropogenic influence. The spectroellipsometric system can be used in different fields where the water quality should be estimated or the presence of a particular set of chemical elements should be revealed.