Industrial expansion has led degradation of the quality of water considerably. Industry is the most significant contributor of pollution. Industries produce several undesirable products including industrial waste, polluted waste water, poisonous gases, chemical residuals, numerous heavy metals, dust smoke etc. Most of the industrial wastes are disposed off in running water or lakes. As a result, poisonous elements reach the reservoirs, rivers and other water bodies. Major water polluting industries are leather, pulp and paper, textiles and chemicals.