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| Name | | | Jurisdiction of Incorporation/Organization |
| Heritage-Crystal Clean, LLC | | Indiana |
| Subsidiaries of Heritage-Crystal Clean, LLC | | |
| Mirachem, LLC | | Delaware |
| Heritage-Crystal Clean, Limited | | A Canadian Corporation |
| | Subsidiary of Heritage-Crystal Clean, Limited | | |
| | Sav-Tech Solvent, Inc. | | Ontario, Canada Corporation |
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| HCC Corporation, LLC | | Delaware |
| Raider Environmental Services of Florida, Inc. | | Florida |
| Source Environmental, Inc. | | Colorado |
| Patriot Environmental Services, Inc. | | California |
| | Subsidiaries of Patriot Environmental Services, Inc. | | |
| | Clear Eyes Wastewater Orange, LLC | | California |
| | Patriot Wastewater, LLC | | California |
| | PWW Portland, LLC | | Delaware |
| | Patriot Environmental Services, Incorporated | | Arizona |
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