Clean Harbors moves a lot of waste between its facilities. This chart shows flows of hazardous waste from one location to another. Most flows are unidirectional, indicative of the fact that the reason Clean Harbors moves waste between facilities is because each specializes in a particular kind of treatment or disposal method. Clean Harbors accounted for 40% of the hazardous waste imported to the United States between 2007 and 2012. Specific amounts are shown on the chart.