A field pilot scale UV-C/H2O2 system investigated for treatment of groundwater contaminated with chlorinated ethenes is presented in this study. Groundwater contamination was mainly represented by trichloroethylene and tetrachloroethylene. The pilot scale unit was set up and its suitability was verified during a testing campaign on site. The results of oxidation tests revealed high efficiency in chlorinated ethenes' removal together with significant decrease of residual total organic carbon content. The presented results emerged from previous unit optimization. Also, economic evaluation of the process is presented.