Abstract
The article presents the results of hydrochemical monitoring of a small river flowing in an urbanized basin in Moscow. Probabilistic estimate is given to the compliance of river water quality with regulatory requirements and the occurrence of high level river pollution (high and extremely high pollution). Specific features of river hydrochemical regime that distinguish the urban watercourse from natural water objects are revealed. The representativeness of the observation data from the institution that controls river water quality is estimated, and the time step of the series of measured water quality characteristics was shown to be insufficient to fully reflect their variations. The reliability of the monitoring data presented by the control institution is too low to adequately assess the level of river water pollution and the efficiency of the measures taken to protect the river
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