Heritage-Crystal Clean, Inc., through its subsidiary, Heritage-Crystal Clean, LLC, provides parts cleaning, hazardous and non-hazardous waste, and used oil collection services to small and mid-sized customers in the industrial and vehicle maintenance sectors in the United States and Canada. It operates in two segments, Environmental Services and Oil Business. The Environmental Services segment offers parts cleaning, containerized waste management, vacuum truck, antifreeze recycling, and field services. The Oil Business segment engages in the collection of used oil, the sale of recycled fuel oil, and used oil filter removal and disposal activities, as well as the re-refining of used oil into lubricant base oil and other products. The company also collects and disposes waste water. As of March 01, 2021, it operated through 89 branches serving approximately 91,000 customer locations. Heritage-Crystal Clean, Inc. was incorporated in 2007 and is headquartered in Elgin, Illinois.