| Facility Name (Alias/Former Names) | City, State, Country | Program Years |
| Advanced Disposal Greentree LF (Onyx Greentree LF; Veolia Greentree LF) | Kersey, PA, USA | |2020| |2017| |2015| |2013| |2010| |
| Advanced Disposal Rolling Hills LF (Onyx FCR Landfill; Veolia ES Solid Waste) | Buffalo, MN, USA | |2013| |2007| |
| Casella Waste Systems Chemung County LF (Operated by Casella Waste Systems) | Elmira, NY, USA | |2012| |
| GFL Arbor Hills LF (Onyx; Veolia; Advanced Disposal) | Northville, MI, USA | |2021| |2016| |2013| |2010| |2005| |
| Heritage-Crystal Clean (Oil Refinery) | Indianapolis, IN, USA | |2023| |2022| |2020| |2018| |2015| |2012| |2008| |2004| |
| Lancaster County SWMA Resource Recovery (Operated by Covanta Energy) | Bainbridge, PA, USA | |2023| |2019| |2014| |2010| |2003| |
| Oakland Heights Development Landfill (Wayne Disposal-Oakland, Inc.) | Auburn Hills, MI, USA | |2013| |
| Oasis Environmental Protection | Xiamen, Fujian, China | |2009| |
| O'Bryan Barrel Co., Inc. | Evansville, IN, USA | |2012| |
| Ohgitani (Thailand) Co., Ltd. | Ayutthaya, Ayutthaya, Thailand | |2007| |
| Ohio Soil Recycling | Columbus, OH, USA | |2024| |2019| |2003| |
| Ohmstede Ltd. | St. Gabriel, LA, USA | |2020| |
| Ohmstede Ltd. | La Porte, TX, USA | |2020| |
| Oil Energy System, Inc. | Arecibo, PR, USA | |2024| |
| Oil Filter Recyclers, Inc. | Astoria, IL, USA | |2023| |2019| |2005| |
| Oil Re-Refining Company (ORRCO) | Portland, OR, USA | |2012| |
| Oklahoma Materials Recycling LLC | Atoka, OK, USA | |2012| |
| Omega Waste Management | Patterson, LA, USA | |2021| |2014| |2012| |2009| |2006| |2001| |
| Omni-Source | Bay City, MI, USA | |2007| |
| OmniSource Corporation | Toledo, OH, USA | |2018| |
| Ondeo Industrial Solutions | Son, North Brabant, Netherlands | |2013| |
| One Co. Ltd. | Gimhae-si, Gyongsangnam-do, South Korea | |2018| |
| Onsite Environmental (Green Tree Processing) | Nashville, TN, USA | |2011| |
| Oostvlaams Milieubeheer (OVMB) | Gent, Flanders, Belgium | |2024| |
| Opersan Solucoes Ambientais S.C. Ltda. | Jundiai, Sao Paulo, Brazil | |2022| |
| Op-Tech Environmental Services, Inc | Waverly, NY, USA | |2012| |
| Orange Coast Computers & Recycling | Fountain Valley, CA, USA | |2009| |
| ORG Chem Group, LLC (Organic Chemical Group; Mid-America Distillations Inc.; MADI; CHEM Group) | Hot Springs, AR, USA | |2019| |2015| |2011| |2007| |
| Organic Incineration Technology (OIT Moose Creek) | North Pole, AK, USA | |2004| |
| Ortec Services Environnement TRD (OSE; Vidam TRD) | Villers-Bretonneux, Picardie, France | |2022| |
| Orusan Kimya ve Akaryakit Urunleri San. Tic. Ltd. Sti. | Tuzla, Istanbul, Turkey | |2017| |
| OSI Environmental Inc. | Anoka, MN, USA | |2023| |2016| |
| OSI Environmental, Inc. | Eveleth, MN, USA | |2015| |2007| |
| OSI Environmental, Inc. | Milwaukee, WI, USA | |2003| |
| Ottumwa Wapello County Landfill | Ottumwa, IA, USA | |2020| |
| Select Environmental (O`Rourke Petroleum) | Houston, TX, USA | |2022| |2017| |
| Shortwood Quarry Landfill Site (Operated by Cory Environmental) | Walsall Wood, Walsall, West Midlands, United Kingdom (England) | |2013| |
| Veolia Environmental Services (Onyx AETS) | North Jackson, OH, USA | |2013| |
| Veolia ES Blackfoot Landfill (Onyx Blackfoot Landfill, Inc.) | Winslow, IN, USA | |2007| |
| Veolia ES Technical Solutions (Onyx ES; Superior; Salesco) | Phoenix, AZ, USA | |2024| |2023| |2022| |2021| |2020| |2019| |2018| |2017| |2016| |2015| |2014| |2013| |2012| |2011| |2010| |2009| |2008| |2007| |2006| |2005| |2004| |2002| |1999| |
| Veolia ES Technical Solutions (Onyx ES; OSCO; CWM) | Azusa, CA, USA | |2024| |2023| |2022| |2021| |2020| |2019| |2018| |2017| |2016| |2015| |2014| |2013| |2012| |2011| |2010| |2008| |2007| |2006| |2005| |2004| |2003| |2002| |2000| |1998| |
| Veolia ES Technical Solutions (Onyx Environmental Services) | Fremont, CA, USA | |2015| |2011| |
| Veolia ES Technical Solutions (Onyx Environmental Services) | Richmond, CA, USA | |2023| |2020| |2018| |2017| |2014| |2011| |2008| |2006| |2004| |2002| |
| Veolia ES Technical Solutions (Onyx ES; OSCO; WM; CWM) | Henderson, CO, USA | |2024| |2023| |2021| |2020| |2018| |2017| |2016| |2015| |2014| |2013| |2012| |2010| |2009| |2007| |2005| |2004| |2003| |2001| |1998| |
| Veolia ES Technical Solutions (Onyx ES; Superior Special Services) | Tallahassee, FL, USA | |2023| |2020| |2019| |2017| |2014| |2011| |2006| |2003| |
| Veolia ES Technical Solutions (Onyx Envrionmental Services; CWM) | Morrow, GA, USA | |2014| |2013| |2010| |2007| |2006| |2004| |2003| |2002| |2001| |1999| |
| Veolia ES Technical Solutions (Onyx Environmental Services; Trade Waste; TWI; CWM) | Sauget, IL, USA | |2024| |2023| |2022| |2021| |2020| |2019| |2018| |2017| |2016| |2015| |2014| |2013| |2012| |2011| |2010| |2009| |2008| |2007| |2006| |2005| |2004| |2003| |2002| |2000| |1998| |1996| |
| Veolia ES Technical Solutions (Onyx Environmental Services) | East Chicago, IN, USA | |2015| |2011| |
| Veolia ES Technical Solutions (Onyx Environmental Services; Shoreland Metals) | Valparaiso, IN, USA | |2007| |2003| |
| Veolia ES Technical Solutions (Onyx Environmental Services) | Louisville, KY, USA | |2015| |2011| |
| Veolia ES Technical Solutions (Onyx ES; Superior Special Services) | Stoughton, MA, USA | |2013| |2012| |2011| |2010| |2009| |2007| |2006| |2005| |2004| |2003| |2002| |2001| |1999| |
| Veolia ES Technical Solutions (Onyx ES; Superior Special Services; Recyclights) | Bloomington, MN, USA | |1999| |1998| |
| Veolia ES Technical Solutions (Onyx ES; WM; AETS) | Creedmoor, NC, USA | |2023| |2022| |2020| |2017| |2016| |2014| |2011| |2008| |2007| |2005| |2003| |2000| |1997| |
| Veolia ES Technical Solutions (Onyx ES; WM; AETC/AETS) | Flanders, NJ, USA | |2024| |2023| |2022| |2020| |2019| |2018| |2017| |2016| |2015| |2014| |2013| |2011| |2010| |2008| |2007| |2005| |2003| |2002| |2001| |1999| |1995| |
| Veolia ES Technical Solutions (Onyx ES; Superior Special Services; Recyclights, Inc.) | Columbus, OH, USA | |1999| |
| Veolia ES Technical Solutions (Onyx ES; CWM; Chem Waste) | West Carrollton, OH, USA | |2024| |2023| |2022| |2021| |2020| |2019| |2018| |2017| |2016| |2015| |2014| |2013| |2012| |2011| |2010| |2009| |2008| |2007| |2006| |2005| |2004| |2003| |2001| |2000| |1996| |
| Veolia ES Technical Solutions (Onyx) | Philadelphia, PA, USA | |2024| |2021| |2018| |2015| |2012| |
| Veolia ES Technical Solutions (Onyx Environmental Services; CWM; USA Waste) | Port Arthur, TX, USA | |2024| |2023| |2022| |2021| |2020| |2019| |2018| |2017| |2016| |2015| |2014| |2013| |2012| |2011| |2010| |2009| |2008| |2007| |2006| |2005| |2004| |2003| |2002| |2000| |1998| |1996| |
| Veolia ES Technical Solutions (Onyx Environmental Services) | North Salt Lake, UT, USA | |2015| |2011| |
| Veolia ES Technical Solutions (Onyx Environmental Services) | Kent, WA, USA | |2015| |2011| |
| Veolia ES Technical Solutions (Onyx Environmental Services) | Vancouver, WA, USA | |2015| |2011| |
| Veolia ES Technical Solutions (Onyx Environmental Services) | Menomonee Falls, WI, USA | |2024| |2023| |2022| |2021| |2020| |2019| |2018| |2017| |2016| |2015| |2014| |2013| |2012| |2011| |2010| |2008| |2007| |2006| |2005| |2004| |2001| |
| Veolia ES Technical Solutions (Onyx Environmental Services; Superior Special Services) | Port Washington, WI, USA | |2024| |2023| |2022| |2021| |2020| |2019| |2018| |2017| |2016| |2015| |2014| |2013| |2012| |2011| |2010| |2009| |2008| |2007| |2006| |2005| |2004| |2003| |2001| |
| Veolia Hickory Meadows Landfill (Onyx) | Hilbert, WI, USA | |2011| |
