Performance of synthetic organic polymer (polyacrylamide) and natural organic polymers (pectin) as flocculant in coagulation-flocculation treatment will be assessed. Colour and COD removal will be observed. The result shows polyacrylamide added in the treatment was best at the optimum pH 5, coagulant dose at 275 mg/ L and flocculant dose at 35 mg/ L with 88 and 80% removal. In contrast, additions of pectin only manage to remove 54.2 and 67 % at the optimum pH 5, coagulant and flocculant dosage at 427.4 mg/ L and 21.9 mg/ L respectively. However, polyacrylamide treatment claimed to be more toxic based on lethal concentration (LC50) at 17 % compare to pectin at 34%.