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Coagulation was performed on synthetic test waters prepared with different concentrations of humic acid (HA) and kaolin to simulate organics and turbidity found in natural surface waters. The alkalinity of the test waters was high (180–205 mg/L) and high basicity PACl was used to coagulate the impurities as it is best suited for high alkalinity waters. Separate removal mechanisms of HA and kaolin has been dealt in detail by many researchers but in this paper the simultaneous removal mechanisms are stressed upon. Synthetic test waters were chosen instead of real surface waters to incorporate the effects of fluctuating organics and turbidity to have better insights into the removal mechanisms. Jar test was used to evaluate the removal efficiency of TOC, DOC, UV₂₅₄ and turbidity. Zeta potential, particle/floc size, pH and alkalinity were also evaluated before and after the coagulation to investigate the charge …