We used the unsaturated simulation model HYDRUS-1D to predict the fate and transport of chloride migration in the vadose zone at four sites in Lea County, New Mexico: two surface spills, one long-term small pipeline leak, and long-term disposal to an unlined pit. We found that long-term disposal to the pit and the pipeline leak created saturated flow to ground water and caused some impairment of ground water quality. At the two surface release sites, HYDRUS-1D predicted sequestration in the vadose zone for up to 350 years. In all cases, the residual chloride in the vadose zone posed no material threat to ground water quality.