| LILouisiana Integrated Polyethylene Jv LLC | Westlake | 100–499 | ● ACTIVE |
| SCSasol Chemicals (usa) LLC - Lake Charles Chemical Complex | Westlake | 500+ | ● ACTIVE |
| WCWestlake Chemicals & Vinyls LLC | Westlake | 20–99 | ● ACTIVE |
 Calca Solutions, LLC | Westlake | — | ● ACTIVE |
| EUEagle US 2 LLC - Lake Charles Complex | Westlake | — | ◐ LIKELY ACTIVE |
| ECEquistar Chemicals LP - Lake Charles Polymers Site | Westlake | — | ◐ LIKELY ACTIVE |
| IVIndorama Ventures Olefin | Westlake | — | ◐ LIKELY ACTIVE |
| LPLouisiana Pigment CO LP | Westlake | — | ◐ LIKELY ACTIVE |
| WPWestlake Petrochemical LP | Sulphur | — | ◐ LIKELY ACTIVE |
| WPWestlake Polymers Corp, Poly 1 & 2 | Sulphur | — | ◐ LIKELY ACTIVE |
| BIBiolab INC | Westlake | — | ◐ LIKELY ACTIVE |
 Carboline Global INC | Lake Charles | — | ◐ LIKELY ACTIVE |
| APAir Products & Chemicals INC | Sulphur | — | ◇ UNVERIFIED |
| HEHalliburton Energy Svcs | Westlake | — | ◇ UNVERIFIED |
 Southern Ionics INC | Sulphur | — | ◇ UNVERIFIED |
| WRW R Grace - Lake Charles Facility | Sulphur | — | ◇ UNVERIFIED |
| LLLacc LLC US - Ethylene & Derivatives Plant | Westlake | — | ◐ LIKELY ACTIVE |
| LILinde INC - Sulphur Plant | Lake Charles | — | ◐ LIKELY ACTIVE |
| PIPpg Industries INC - Silica Plant | Westlake | — | ◐ LIKELY ACTIVE |
| CCCertainteed CORP - Lake Charles Polymer Plant | Westlake | — | ◐ LIKELY ACTIVE |
| LCLake Charles Methanol Ii LLC - Lake Charles Methanol Facility | Westlake | — | ◐ LIKELY ACTIVE |
| ALAir Liquide America CORP | Westlake | — | ◇ UNVERIFIED |
| ALAlac Lake Charles Asu | Sulphur | — | ◇ UNVERIFIED |
| BLBig Lake Fuels LLC - Big Lake Fuels Methanol Plant | Lake Charles | — | ◇ UNVERIFIED |
| COClearwater of Le Firm Part 2, LLC | Lake Charles | — | ◇ UNVERIFIED |
| ECEquistar Chemicals LP | Westlake | — | ◇ UNVERIFIED |
| GTG2o Technologies LLC - Westlake Facility | Westlake | — | ◇ UNVERIFIED |
| LILinde INC - Westlake Compressor Facility | Westlake | — | ◇ UNVERIFIED |
| MTMatheson Tri-gas INC - Westlake I & Ii Facility | Westlake | — | ◇ UNVERIFIED |
| PIPpg Industries Inc/lake Charles Complex | Lake Charles | — | ◇ UNVERIFIED |
| RSResin Sys INC | Sulphur | — | ◇ UNVERIFIED |
| SNSasol North America INC - Lab Plant | Westlake | — | ◇ UNVERIFIED |
| Southern Ionics INC. - Lake Charles Facility | Carlyss | — | ◇ UNVERIFIED |
| TLTdc LLC - Westlake Plant | Westlake | — | ◇ UNVERIFIED |
| TCTetra Chemicals | Westlake | — | ◇ UNVERIFIED |
| CMCarboline Manufacturing Lake Charles | Lake Charles | 20–99 | ◐ LIKELY ACTIVE |
| CVCremer Volunteer Pastilles | Lake Charles | 20–99 | ◐ LIKELY ACTIVE |
| LLLacc, LLC | Westlake | 100–499 | ◐ LIKELY ACTIVE |
| LCLake Charles | Sulphur | 100–499 | ◐ LIKELY ACTIVE |
| LCLotte Chemical Louisiana, LLC | Westlake | 20–99 | ◐ LIKELY ACTIVE |
| QUQEMETICA US Silica LLC | Westlake | 100–499 | ◐ LIKELY ACTIVE |
| SLSII Lake Charles | Carlyss | 20–99 | ◐ LIKELY ACTIVE |
| WLWest Lake ASU | Westlake | 20–99 | ◐ LIKELY ACTIVE |
| WGWR Grace & Co. Inc | Sulphur | 100–499 | ◐ LIKELY ACTIVE |
| HHH & H Chemical CO | Lake Charles | — | ◐ LIKELY ACTIVE |
| ACArch Chemicals CORP - Lake Charles Plant | Westlake | — | ◇ UNVERIFIED |
| ACAxiall Corporation | Westlake | — | ◇ UNVERIFIED |
| FPFirestone Polymers - Lake Charles Facility | Sulphur | — | ◇ UNVERIFIED |
| LILinde INC - Carlyss Psa Facility | Sulphur | — | ◇ UNVERIFIED |
| MTMatheson Tri-gas INC - Pelican Air Separation Unit | Westlake | — | ◇ UNVERIFIED |
