Heritage-Crystal Clean, Inc., through its subsidiary, Heritage-Crystal Clean, LLC, provides parts cleaning, and hazardous and non-hazardous containerized waste services to small and mid-sized customers in the vehicle maintenance and manufacturing services industries in North America. 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. This segment also collects and disposes waste water. As of February 28, 2018, the company operated through 86 branches serving approximately 108,000 customer locations. Heritage-Crystal Clean, Inc. was incorporated in 2007 and is headquartered in Elgin, Illinois.