Clean Harbors, Inc. engages in the provision of environmental, energy, and industrial services. The company is headquartered in Norwell, Massachusetts and currently employs 22,796 full-time employees. The firm delivers a range of services, such as end-to-end hazardous waste management, emergency spill response, industrial cleaning and maintenance, and recycling services. Its Environmental Services segment offers an array of services to customers. The company collects, transports, treats and disposes of hazardous and non-hazardous waste through its network of waste disposal facilities, including incinerators, landfills, treatment, storage and disposal facilities (TSDFs), wastewater treatment facilities and solvent recycling centers. Its Safety-Kleen Sustainability Solutions (SKSS) segment offerings span the lifecycle of sustainable lubricant products. The company collects used oil which serves as feedstock for its oil re-refineries. At these facilities, it manufactures, formulates and packages lubricants which are returned to the marketplace. The company also provides parts washers and environmental services to various customers.