Humic compounds are among the most important natural organic matters (NOM) existing in water resources, and are known as one of the main disinfection by-product (DBP) precursors – particularly trihalomethanes (THMs) and haloacetic acids (HAAs) – which may act as health risk factors. The study objective is to investigate the UV/TiO₂ photo-catalytic process in removing humic substances from water. It was conducted in a lab-scale batch photo-catalytic reactor using the experimental method. It may be concluded that the UV/TiO₂ process can provide desirable drinking water quality in terms of humic substances, so this process was capable of decreasing 5 mg/L dissolved organic carbon to 0.394 mg/L in optimum conditions. The specific UV₂₅₄ absorbance of 2.79 L/mg.m was attained by photo-catalytic first-order reaction having rate constant of 0.267 min^-1 after 90 minutes.