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This dataset was acquired using the Sensichips SCW water sensor and contains Electrical Impedance Spectroscopy (EIS) measurements saved as CSV. Data include 10 impedance-related channels measured on five interdigitated electrodes (IDEs) (Platinum, Gold, Silver, Nickel) at 78,125 Hz and 200 Hz AC frequencies, including in-phase and (where available) quadrature components. The dataset is organized into: TRAINING measurements for ML development RAW: ADC output values (16-bit, two’s complement integer range −32768 to 32767) NORMALIZED: same signals after baseline normalization using a difference vs. backround-water reference TEST measurements to evaluate model generalization on unseen data. It contains three measurement campaigns (Set 1–Set 3) featuring multiple substances dissolved in tap water, including repeated experiments and procedures designed to capture concentration changes, sensor drift (multiple sensors), and turbulence events for robustness testing and data augmentation studies. More information is available at: https://sensichips.com/water-sensor/