The quality of water is the characteristic of struc-ture and properties of water, its defining suitability for concrete types of water use. Quality control of waters is check of compliance of indicators of quali-ty of waters to the established norms and re-quirements. The increase of efficiency of cleaning of a surface water and control of their quality are priority directions in water resources preservation. Criterion of an assessment of pollution of water this or that substance is its maximum permissible con-centration (MPC). At simultaneous use of water ob-ject or its site by several types of water use the pri-ority is given to the most rigid norms, i.e. fishery. It is established that in the Yenisei river, near the vil-lage of Atamanovo the water mineralization in the river fluctuates ranging from 113 to 147 mg/l (max-imum concentration limit is 1000 mg/l). The content of the oxygen dissolved in the water during all sea- sons of year is in optimum size is from 10.2 to 13.3 mg/l (maximum concentration limit of 6.0 mg/l). The content of the weighed substances for 3 years av-eraged 5.78 mg/l. The monitoring of the hydro-chemical mode of water of the Yenisei near the vil-lage of Atamanovo and dynamics of component structure was carried out. The content of the pollut-ing substances in the water was determined by 17 ingredients. During the irrigating period high level contamination with iron, copper, zinc, nickel and cadmium was noted. By the end of the vegetative period there was an increase in the maintenance of indicators of irrigational coefficient (chlorine, sodi-um and sulfates). Criterion of an assessment of quality of water at the irrigating periods was esti-mated on irrigational coefficient of Stebler, and it was established that this coefficient equaled 1.65 and characterized the quality of irrigation water as unsatisfactory.