Supersaturated Water Injection (SWI) is an effective technology for Nonaqueous Phase Liquid (NAPL) recovery. Carbon dioxide (CO2) supersaturated water injected into the subsurface results in the nucleation of CO2 bubbles at and away from the injection point. As the supersaturated liquid flows through the porous medium, gas evolution occurs in situ as the system returns to thermodynamic equilibrium. The nucleating bubbles coalesce, rise and volatilize residual NAPL ganglia.