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Clean Harbors is North America's largest hazardous-waste handler — it collects the toxic, flammable and regulated waste that chemical plants, refineries and factories can't legally throw away, then burns it in incinerators, buries it in permitted landfills or re-refines used oil into new base oil. It runs the continent's biggest network of high-temperature incinerators (permits so scarce that its 2024 Kimball, NE plant was the first new one built in ~25 years), plus the Safety-Kleen used-oil and parts-cleaning franchise.

A supply chain that runs in reverse

Most companies buy raw materials and ship products out. Clean Harbors runs the loop backwards: waste flows IN from chemical plants, refineries and factories, and the company destroys it in incinerators, buries it in landfills, or re-refines used oil into new base oil that flows back out to the market.

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