The process of Enhanced Reductive Dechlorination (ERD) for the biological degradation of chlorinated compounds, is now a widely used and proven in situ remediation approach. Nevertheless, ERD is often used only as a ‘polishing step’ of the plume, rather than a stand-alone primary remediation technology. In our experience, the potential of ERD is much more powerful than a final stage to address residual dissolved phase contamination. In many cases, it is the only viable remediation option available when site conditions are difficult, as was the case at this an active industrial site located at an airport in the Southwest of France.