Natural anionic polysaccharide of plantago psyllium mucilage is found to be a very effective flocculant capable of removing almost 85 and 95 percentages of suspended solid from sewage and tannery wastewater samples, respectively. A very low flocculant concentration of 1.2 mg/L was capable of removing appreciable amount of SS and the most suitable pH was found to be neutral. The optimal treatment time was found to be 1h. The XRD patterns were used as a supportive evidence for suggesting the possible mechanism of flocculation.