Comparative Analysis of the Chemical Composition of Drinking Water in Municipalities of the Tyumen Region

Introduction: A close relationship between the chemical composition of consumed water and the elemental structure of the human body has been proven. Objective: A comparative physiological and hygienic assessment of the chemical composition of drinking water in the cities of Tyumen, Khanty-Mansiysk, and Salekhard. Materials and Methods: From June to September 2024, 60 samples of tap water taken from three cities of the Tyumen Region were tested using atomic absorption spectrometry and capillary electrophoresis to determine Ca, Mg, Cu, Zn, Se, and Fe levels. The results were then compared with the maximum allowable concentrations of the chemicals and WHO drinking water health-based values. Results: Calcium concentrations in all water samples were 2.4–7.3 times lower than the recommended range, with the lowest levels found in Salekhard and the highest in Tyumen (p < 0.001). Magnesium concentrations were also 4.6 to 5.5 times below the health-based value in all samples. Copper, zinc, and selenium levels were many times lower than the recommended ranges, with a significant excess of those for Zn and Se in Tyumen over those in Khanty-Mansiysk (p = 0.020 and p < 0.001) and Salekhard (p = 0.005 and p < 0.001), respectively. Iron concentrations in drinking water in Tyumen were 4 times lower than the maximum allowable level, in Khanty-Mansiysk they were at the upper limit, and in Salekhard they exceeded it. Conclusions: Ca, Mg, Cu, Zn, and Se concentrations in the water samples from the cities of Tyumen, Khanty-Mansiysk, and Salekhard do not exceed permissible values but they fail to comply with the recommended levels. IIn Salekhard, iron concentrations in tap water exceeded both the permissible and recommended levels.