This study was undertaken to use Azolla pinnata in waste water management and production of livestock feed. Different Physico-chemical parameters found in sewage water like, color, odor, Ph., Electric Conductivity (EC), Total Suspended Solids (TSS), Total Dissolved Solids (TDS), Chemical Oxygen Demand (COD), Biological Oxygen Demand (BOD) and Chromium, Copper and Zink as heavy metals were analyzed according to Standard methods for the examination of water and waste water before and after inoculation of Azolla pinnata. Data revealed that Azolla pinnata was very effective in treating waste water, the resultant bio-treated sewage water appeared to have physico-chemical parameters better than the Permissible limits EPCB. The resultant Azolla pinnata biomass was introduced as a sole feed to Wistar rats. The present study concluded that Azolla pinnata used in treating waste water could be used as animal feed.