| CSCairo Sulphur Products | Cairo | OH | — | ◇ UNVERIFIED |
 Calgon Carbon CORP - Neville Island Plt | Pittsburgh | PA | — | ◇ UNVERIFIED |
| CCCameron Chemical INC | Suffolk | VA | — | ◇ UNVERIFIED |
| CCCarbonfree Chemicals | San Antonio | TX | — | ◇ UNVERIFIED |
| CCCarus Corporation Belmont Site | Belmont | NC | — | ◇ UNVERIFIED |
| CHCastle Hayne, Nc | Castle Hayne | NC | — | ◇ UNVERIFIED |
| CICatalytic Innovations - North Plant | Rolla | MO | — | ◇ UNVERIFIED |
| CICaterpillar INC. | Boonville | MO | — | ◇ UNVERIFIED |
| CLCelanese LTD | Calvert City | KY | — | ◇ UNVERIFIED |
| CTCentauri Technologies | Pasadena | TX | — | ◇ UNVERIFIED |
| CICf Industries - Donaldsonville Nitrogen Complex | Donaldsonville | LA | — | ◇ UNVERIFIED |
| CICf Industries Nitrogen LLC | Yazoo City | MS | — | ◇ UNVERIFIED |
| CICf Industries Nitrogen, LLC - Port Neal Complex | Sergeant Bluff | IA | — | ◇ UNVERIFIED |
| CFChem Fleur Division of Firmenich | Newark | NJ | — | ◇ UNVERIFIED |
| CDChemical Dynamics INC | Plant City | FL | — | ◇ UNVERIFIED |
| CMChemical & Metal Industries INC | Hudson | CO | — | ◇ UNVERIFIED |
| CPChemical Products Corporation | Cartersville | GA | — | ◇ UNVERIFIED |
| CCChemol Company, INC. | Greensboro | NC | — | ◇ UNVERIFIED |
| CWChemours-chambers Works | Penns Grove | NJ | — | ◇ UNVERIFIED |
| CChemtrade | Anacortes | WA | — | ◇ UNVERIFIED |
| CPChemtrade Phosphorus Specialties LLC | Lawrence | KS | — | ◇ UNVERIFIED |
| CCChemtura CORP | Bay Minette | AL | — | ◇ UNVERIFIED |
 Chevron Phillips Chemical Company LP - Cedar Bayou | Baytown | TX | — | ◇ UNVERIFIED |
| CACoatings & Adhesives CORP | Leland | NC | — | ◇ UNVERIFIED |
| CCCognis Corporation/mauldin, Sc Manufacturing Plant | Mauldin | SC | — | ◇ UNVERIFIED |
| CUCoim USA | Paulsboro | NJ | — | ◇ UNVERIFIED |
| CCColonial Chemical CO | Tabernacle | NJ | — | ◇ UNVERIFIED |
| CSColorado Salt Products | Denver | CO | — | ◇ UNVERIFIED |
| CCColumbian Chemicals Company (north Bend Carbon Black Plant) | Centerville | LA | — | ◇ UNVERIFIED |
| CICommerce Indl Chemicals INC | Milwaukee | WI | — | ◇ UNVERIFIED |
 Comstar International, INC. | College Point | NY | — | ◇ UNVERIFIED |
| CIConagra International Fertilizer | Shakopee | MN | — | ◇ UNVERIFIED |
| CPConroe Plant | Conroe | TX | — | ◇ UNVERIFIED |
| CRContinental Refining CO LLC | Somerset | KY | — | ◇ UNVERIFIED |
| CRCooper River Partners, LLC | Goose Creek | SC | — | ◇ UNVERIFIED |
| CACorteva Agriscience - Pittsburg Operations | Pittsburg | CA | — | ◇ UNVERIFIED |
| CFCorteva Freeport Operations | Freeport | TX | — | ◇ UNVERIFIED |
| CHCp Hall Co, the | Stow | OH | — | ◇ UNVERIFIED |
| CICreanova INC | Theodore | AL | — | ◇ UNVERIFIED |
| CCCriterion Catalysts & Technologies LP | Michigan City | IN | — | ◇ UNVERIFIED |
| CCCrnf - Coffeyville | Coffeyville | KS | — | ◇ UNVERIFIED |
| CICroda, INC. Atlas Point Plant Site | New Castle | DE | — | ◇ UNVERIFIED |
| CSCronimet Specialty Metals USA INC - Suite 103 | Bedford | PA | — | ◇ UNVERIFIED |
| CPCrop Production Services INC | Alpaugh | CA | — | ◇ UNVERIFIED |
| CLCymer LLC | Decatur | TN | — | ◇ UNVERIFIED |
| CICytec Industries | Kalamazoo | MI | — | ◇ UNVERIFIED |
| CICytec Industries INC | Mount Pleasant | TN | — | ◇ UNVERIFIED |
| CSCytec Surface Specialties | Langley | SC | — | ◇ UNVERIFIED |
| DTDanchem Technologies INC | Danville | VA | — | ◇ UNVERIFIED |
| DUDanisco US INC | Cedar Rapids | IA | — | ◇ UNVERIFIED |
