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The study involved a laboratory experiment on the use of Lemna minor L.in the phytoremediation of a stream polluted by waste water from Kaduna Refinery and Petrochemical Company. The physiochemical characteristics of the waste water were determined before and after the treatment. The experiment lasted for three weeks and the rate of reduction was recorded. The highest rate of mean reduction were for heavy metals accounting 99.6%, 93.3%, 99.3%, 94.3%, 100% and 95.4% of Cd, Hg, Zn, Mn, Pb and Ag respectively. Other physiochemical parameters include Total Dissolved Solids (TDS) 81.3%, Chemical Oxygen Demand (COD) 91.6%, Nitrate 93.3%, Biochemical Oxygen demand (BOD) 68%, Conductivity 50.3%, Total suspended Solids (TSS) 77.3%, Turbidity 85%, 81% Total Solids (TS) and the pH were increase from 6.29 to 7.7.Lemna minor L. is a suitable candidate for effective phytoremediation of water from Romi stream.  Key words: Efficiency, Lemna minor L. Phytoremediation, Romi Stream

The Efficiency of Lemna minor L. in the Phytoremediation of Romi Stream: A Case Study of Kaduna Refinery and Petrochemical Company Polluted Stream