| OFOberon Fuels Kershaw Facility | Brawley | CA | — | ◇ UNVERIFIED |
| OCOceanside City of Water Utilities Dept/slrwwtp | Oceanside | CA | — | ◇ UNVERIFIED |
| OIOctochem INC | Vandalia | IL | — | ◇ UNVERIFIED |
| OIOemeta INC. | Salt Lake City | UT | — | ◇ UNVERIFIED |
| OCOil Chem INC | Flint | MI | — | ◇ UNVERIFIED |
| OSOilfield Solutions Midland | Midland | TX | — | ◇ UNVERIFIED |
| OROil Recovery INC | Camilla | GA | — | ◇ UNVERIFIED |
| OROil Re Refining CO INC - Kennewick Facility | Kennewick | WA | — | ◇ UNVERIFIED |
| OCOlin CORP - Moundsville Plant | Moundsville | WV | — | ◇ UNVERIFIED |
| OPOlympic Petroleum Corporation | Cicero | IL | — | ◇ UNVERIFIED |
| OEOmg Electronic Chemicals | South Plainfield | NJ | — | ◇ UNVERIFIED |
| OSOmnova Solutions INC. - Calhoun Latex Plant | Calhoun | GA | — | ◇ UNVERIFIED |
| OBOpen Book Extracts | Roxboro | NC | — | ◇ UNVERIFIED |
| OIOptiblend Industries-cambridge | Cambridge | OH | — | ◇ UNVERIFIED |
| OIOptiblend Industries, INC. | Midland | TX | — | ◇ UNVERIFIED |
| OCOrg Chem Group LLC | Evansville | IN | — | ◇ UNVERIFIED |
| OBOwen Biosciences INC | Baton Rouge | LA | — | ◇ UNVERIFIED |
| PBPacific Biodiesel Honolulu | Honolulu | HI | — | ◇ UNVERIFIED |
| PEPacific Environmental Resources INC | Santa Rita | GU | — | ◇ UNVERIFIED |
| PPPacific Precision Formulators INC | Vernon | CA | — | ◇ UNVERIFIED |
| PCPackaging Concepts | Lincoln | RI | — | ◇ UNVERIFIED |
| PCParkson Corporation | Trussville | AL | — | ◇ UNVERIFIED |
| PMPdq Manufacturing, INC. | De Pere | WI | — | ◇ UNVERIFIED |
| PTPeach Tree Door Company | Saint Joseph | MO | — | ◇ UNVERIFIED |
| PMPeck Marine Terminal | Chesapeake | VA | — | ◇ UNVERIFIED |
| PCPeco Corporation | Auburn Hills | MI | — | ◇ UNVERIFIED |
| PSPennzoil-quaker State CO (dba Sopus Products Lalp) | Wilmington | CA | — | ◇ UNVERIFIED |
| PSPennzoil-quaker State Company (dba Sopus Products) (no Longer Subject to Frp) | Maryland Heights | MO | — | ◇ UNVERIFIED |
| PQPennzoil Quaker-state CO. Sopus Products | Tehachapi | CA | — | ◇ UNVERIFIED |
| PSPennzoil-quaker State (dba Sopus Products) | Newell | WV | — | ◇ UNVERIFIED |
| PSPennzoil-quaker State Dba Sopus Products | Fowlerville | MI | — | ◇ UNVERIFIED |
| PQPennzoil Quaker State - Valley View Pack | Shreveport | LA | — | ◇ UNVERIFIED |
| PCPenray Cos INC | Wheeling | IL | — | ◇ UNVERIFIED |
| POPerma-fix of South Georgia | Valdosta | GA | — | ◇ UNVERIFIED |
| PDPetrochoice Dynamo, LLC | Indianapolis | IN | — | ◇ UNVERIFIED |
| PRPetroleum Recycling CORP | Philadelphia | PA | — | ◇ UNVERIFIED |
| PSPetroleum Service Consultant LLC | Medley | FL | — | ◇ UNVERIFIED |
| PSPhilip Services Hawaii LTD (allwaste) - Oil Recycling Plant | Kapolei | HI | — | ◇ UNVERIFIED |
| PPPhoenix Products CO | Terryville | CT | — | ◇ UNVERIFIED |
| PRPhoenix Resins INC | Cinnaminson | NJ | — | ◇ UNVERIFIED |
| PCPico Chemical CORP | Chicago Heights | IL | — | ◇ UNVERIFIED |
| PRPine Ridge Transportation | Tanner | AL | — | ◇ UNVERIFIED |
| PPioneer | Johnston | IA | — | ◇ UNVERIFIED |
| PCPirelli Cable and Systems LLC | West Columbia | SC | — | ◇ UNVERIFIED |
| PPPitt Penn Recycling LLC | Creighton | PA | — | ◇ UNVERIFIED |
| PPixelteq | Largo | FL | — | ◇ UNVERIFIED |
| PIPka INC Prokrete Ind | Denver | CO | — | ◇ UNVERIFIED |
| PGPlaze Georgia (apollo Technologies, Inc) | Smyrna | GA | — | ◇ UNVERIFIED |
| PCPlz CORP | Saint Clair | MO | — | ◇ UNVERIFIED |
| PIPolymerics INC | Kent | OH | — | ◇ UNVERIFIED |
| PCPolyone CORP. | Wynne | AR | — | ◇ UNVERIFIED |
| PLPolyventive, LLC | Calhoun | GA | — | ◇ UNVERIFIED |
| PFPort Fourchon North | Golden Meadow | LA | — | ◇ UNVERIFIED |
| PSPower Service Prods INC | Weatherford | TX | — | ◇ UNVERIFIED |
| PPP P F Norda INC | East Hanover Township | NJ | — | ◇ UNVERIFIED |
| PCPpg Chemfil-troy | Troy | MI | — | ◇ UNVERIFIED |
| POPrecision Optical | Costa Mesa | CA | — | ◇ UNVERIFIED |
| PPresstek | Des Plaines | IL | — | ◇ UNVERIFIED |
| PEPrime Eco Group INC | Wharton | TX | — | ◇ UNVERIFIED |
| PIProchemco INC. | Lake Station | IN | — | ◇ UNVERIFIED |
| PCProducto Chemicals | Livonia | MI | — | ◇ UNVERIFIED |
| PRProgress Rail Services Corporation | East Chicago | IN | — | ◇ UNVERIFIED |
| PFPuraglobe Florida LLC | Tampa | FL | — | ◇ UNVERIFIED |
| PTPurcell Tire and Service Center | Anchorage | AK | — | ◇ UNVERIFIED |
| PBPyrotechnique By Grucci, INC. | Radford | VA | — | ◇ UNVERIFIED |
| QCQuaker Chemical CORP. | Detroit | MI | — | ◇ UNVERIFIED |
| QHQuaker Houghton | Strongsville | OH | — | ◇ UNVERIFIED |
| QHQuaker Houghton | Indianapolis | IN | — | ◇ UNVERIFIED |
 Qualichem, INC. (plant 3) | Verdi | NV | — | ◇ UNVERIFIED |
| QCQuality Car Care Products INC | Duarte | CA | — | ◇ UNVERIFIED |
| QTQuanta Tech LLC | Lacassine | LA | — | ◇ UNVERIFIED |
 Radco Industries INC | La Fox | IL | — | ◇ UNVERIFIED |
| RHReagents Holdings LLC | Charlotte | NC | — | ◇ UNVERIFIED |
| RGRed Giant Oil Company | Council Bluffs | IA | — | ◇ UNVERIFIED |
| RGRed Giant Oil Company LLC | Ogden | UT | — | ◇ UNVERIFIED |
| RLRed Line Synthetic Oil CORP. | Benicia | CA | — | ◇ UNVERIFIED |
| RCReef Chemical CO INC | Odessa | TX | — | ◇ UNVERIFIED |
| RFReliance Fluid Technologies, LLC. | Niagara Falls | NY | — | ◇ UNVERIFIED |
| RRRenew Resources LLC | Rock Hill | SC | — | ◇ UNVERIFIED |
| RLRezolex, LTD | Radium Springs | NM | — | ◇ UNVERIFIED |
| RPRhone Poulenc Incorporated | Philadelphia | PA | — | ◇ UNVERIFIED |
| RRilco | Rock Island | IL | — | ◇ UNVERIFIED |
| RGRio Grande Cotton Oil Mill | Harlingen | TX | — | ◇ UNVERIFIED |
| RJR J Recycling LLC | Parkersburg | WV | — | ◇ UNVERIFIED |
| RCRoadway Construction | Tacoma | WA | — | ◇ UNVERIFIED |
| RMRobert Morgan INC | Kansas | IL | — | ◇ UNVERIFIED |
| RIRock Island Lubricants Company | Moline | IL | — | ◇ UNVERIFIED |
| RERockwater Energy Solutions | El Reno | OK | — | ◇ UNVERIFIED |
| RCRogers CORP - Price | Chandler | AZ | — | ◇ UNVERIFIED |
| RURohmax USA | Horsham | PA | — | ◇ UNVERIFIED |
| RARoman Adhesives INC | Calumet City | IL | — | ◇ UNVERIFIED |
| RERomic Environmental Technologies CORP | Palo Alto | CA | — | ◇ UNVERIFIED |
| RORosemead Oil Products INC | Santa Fe Springs | CA | — | ◇ UNVERIFIED |
| R6Route 66 Vapor | Albuquerque | NM | — | ◇ UNVERIFIED |
| RURs Used Oil Services INC | Jackson | MO | — | ◇ UNVERIFIED |
| RURs Used Oil Services INC (former) | Wheatland | WI | — | ◇ UNVERIFIED |
| RURs Used Oil Services INC - Former Site of | Des Moines | IA | — | ◇ UNVERIFIED |
| RPRycoline Products INC | Chicago | IL | — | ◇ UNVERIFIED |
| SHSafc Hitech | Haverhill | MA | — | ◇ UNVERIFIED |
| SSSafety-kleen Service Center | Silver Spring | MD | — | ◇ UNVERIFIED |
