Specialists of the Central Specialized Inspectorate for Analytical Control of the Ministry of Ecology and Natural Resources of the Republic of Tatarstan together with the State Committee for Biological Resources of the Republic of Tatarstan took natural water samples at the mouth of the Myosha river in Rozhdestveno village - 2 and 50 meters from the coast. Analyzes were carried out on 13 indicators. According to the results, an excess of relatively maximum permissible concentrations was noted for sulfates (1.6 and 1.3 times) and manganese (3 and 3.9 times). According to specialists of the Central Specialized Inspectorate for Analytical Control of the Ministry of Ecology, based on many years of observations, the indicators do not pose a threat to the water body and its inhabitants and are characteristic of Myosha.