Nanotechnology is a branch with a great potential and boost today. Nano materials are being widely used for the remediation of toxic pollutants. This study evaluates effectively of using commercial zerovalent iron (ZVI) powder and laboratory-synthesized nanoscale zerovalent iron (NZVI) particles unde different conditions (temperatures, time and pH) to eliminate chlorinated organic pollutants as pentaclorophenol (PCP) and trichloroethylene (TCE) from aqueous systems. The effect of pH, temperature, and contact time on chlorinated organic pollutant removal was investigated. The description of produced NZVI particles was done via XRD investigation. The dechlorination of PCP or TCE was measured as an indication of increasing chloride ion. The results showed that the maximum removal of PCP (100%) and TCE (95%) by NZVI could be achieved at lower pH as well as increasing temperature, and increasing time of reaction. Also, the results showed that NZVI was more effective to remove pollutants compared to ZVI powder. The removal effluence   by NZVI was increased 21% and 34% for PCP and TCE respectively compared with ZVI powder. Nanoscale zero-valent iron (NZVI) is considered as an excellent reduction catalyst due to fast degradation of chlorinated pollutants. Thus, in future applications where NZVI is used to remediate sites contaminated with chlorinated organic pollutants.