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Arsenic content in groundwater imposes a great threat to people worldwide. As (III) which is toxic element and creates adverse effect to the human health.The present study deals with removal of arsenic from aqueous solution using low cost activated carbon prepared from Delonix regia (gulmohar seed pods).In adsorption solute present in dilute concentration in liquid or gas phase is removed by contacting with suitable solid adsorbent so that the transfer of component first takes place on the surface of the solid and then into pore of the solid. Batch adsorption study were conducted by varying the contact time, adsorbent dosage & pH