Water quality is traditionally assessed using epidemiological, organoleptic, sanitary-toxicological, and radiation criteria. However, recently, increasing evidence points to the need to consider the structure of aqueous solutions, especially when used for therapeutic purposes. In this study, electrophysical methods were used to study aqueous solutions of sodium chloride of varying concentrations, drinking water, mineral water, and seawater. Patterns in the frequency and amplitude changes of a sinusoidal oscillator compared to distilled water were identified. Based on experimental data, the Ks coefficient is proposed for assessing the structure of drinking and mineral waters. It is defined as the ratio of the oscillation amplitude of the generator at its minimum frequency to the oscillation amplitude at its maximum frequency. A theoretical justification for the formation of the structural organisation of aqueous solutions depending on the concentration of dissolved salts is presented, taking into account the presence of associated and "free" water dipoles, as well as the formation of hydrate formations in a liquid medium. The need to account for intermolecular interaction forces involving water dipoles is emphasised.