The Engineering News-Record (ENR) slotted Clean Harbors to the fifth rank in its annual "Top 200 Environmental Firms" list.
In addition to the full rankings, Clean Harbors placed top 20 in a number of subcategories, including: No. 1 hazardous waste firm; No. 1 firm for private clients; No. 4 construction management/ project management firm; No. 5 firm working outside of the United States; No. 9 environmental management firm and No. 17 wastewater treatment firm.