The Engineering News-Record (ENR) ranked Clean Harbors third in its annual "Top 200 Environmental Firms" list. The slot is up two from 2016's fifth place rank.
In addition to the full rankings, Clean Harbors placed top 20 in a number of subcategories, including No. 1 hazardous waste firm - more than doubling the revenue of the second ranked company.
Clean Harbors was also named the best firm for private clients and ranked seventh for working in locations outside of the United States.