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This study aims to evaluate and compare the water quality of Khlong Chang over a four-year period between 2023 and 2026. The investigation involved monitoring physical and chemical parameters, including water temperature, surface water temperature, pH, turbidity, dissolved oxygen (DO), electrical conductivity (EC), and salinity. The results indicate that the water temperature ranged from 29–32 °C, while the surface temperature varied between 29–35 °C, showing slight seasonal fluctuations. The pH values were recorded between 6.98 and 8.26, characterizing the water as neutral to slightly alkaline, which remains close to standard criteria. Turbidity levels ranged from 22.25 to 28.89 NTU, with a slight upward trend observed in certain years, potentially due to suspended solids or activities within the surrounding area. Dissolved oxygen (DO) remained within a normal and suitable range of 4.52–5.73 mg/L. Notably, electrical conductivity increased from approximately 163.12 µS/cm in 2023 to 250.2 µS/cm in 2026, reflecting an increase in minerals or dissolved substances in the water. Salinity remained between 100 and 115.65 ppm, classified within freshwater levels. In summary, the study found that the water quality of Khlong Chang over the four-year period was in good to moderate condition. However, the rising trends in electrical conductivity and turbidity may be associated with human activities and nearby industrial factories. Therefore, continuous monitoring and surveillance are recommended to prevent long-term environmental impacts.