| KPKaneka Pasadena Site | Pasadena | — | ◇ UNVERIFIED |
| KSKao Specialties Americas | Pasadena | — | ◇ UNVERIFIED |
| KBKetjen Bayport Plant | Pasadena | — | ◇ UNVERIFIED |
| LGLaporte Generating Station | La Porte | — | ◇ UNVERIFIED |
| LPLa Porte Plant | La Porte | — | ◇ UNVERIFIED |
| LPLa Porte Polypropylene | Deer Park | — | ◇ UNVERIFIED |
| LHLonza Houston | Houston | — | ◇ UNVERIFIED |
| LALubrizol Advanced Materials La Porte | La Porte | — | ◇ UNVERIFIED |
| LILyondellbasell Industries | Pasadena | — | ◇ UNVERIFIED |
| MIMacdermid INC | Pasadena | — | ◇ UNVERIFIED |
| MSMapei South | Houston | — | ◇ UNVERIFIED |
| MPMemc Pasadena, Incorporated | Pasadena | — | ◇ UNVERIFIED |
| MLMesser LLC | La Porte | — | ◇ UNVERIFIED |
| NINA Industries Pasadena | Pasadena | — | ◇ UNVERIFIED |
| NNeurogene | Houston | — | ◇ UNVERIFIED |
| NSNippon Shokubai America Industries Pasadena | Pasadena | — | ◇ UNVERIFIED |
| NHNIS Holdings Inc. | Houston | — | ◇ UNVERIFIED |
| NNurevolution | Katy | — | ◇ UNVERIFIED |
| OVOxy Vinyls Deer Park Vcm Plant | Deer Park | — | ◇ UNVERIFIED |
| OVOxy Vinyls LP - Deer Park Vcm Facility | Deer Park | — | ◇ UNVERIFIED |
| PPPasadena Plant | Pasadena | — | ◇ UNVERIFIED |
| PPPasadena Plant | Pasadena | — | ◇ UNVERIFIED |
| PPPasadena Plastics Complex | Pasadena | — | ◇ UNVERIFIED |
| PCPilot Chemical Company | Houston | — | ◇ UNVERIFIED |
| PPPl Propylene LLC | Houston | — | ◇ UNVERIFIED |
| PPPolyethylene Plant | Deer Park | — | ◇ UNVERIFIED |
| PMPoly Marketing & Associates INC | Houston | — | ◇ UNVERIFIED |
| PGPolymers Group Olybilt Lab | Houston | — | ◇ UNVERIFIED |
| PPPolypropylene Plant | Deer Park | — | ◇ UNVERIFIED |
| PSPop Soap | Houston | — | ◇ UNVERIFIED |
| PAPpg Architectural Coatings | Houston | — | ◇ UNVERIFIED |
| PGPPS Global LLC | Houston | — | ◇ UNVERIFIED |
| PCPraxair Channelview Psa | Houston | — | ◇ UNVERIFIED |
| PDPraxair Distribution INC | Pasadena | — | ◇ UNVERIFIED |
| RMRapid Marine Fuels | La Porte | — | ◇ UNVERIFIED |
| RUReagens USA Bayport Plant | Pasadena | — | ◇ UNVERIFIED |
| RLRockwood Lithium INC | Pasadena | — | ◇ UNVERIFIED |
| SBSepton Business Unit | Pasadena | — | ◇ UNVERIFIED |
| SSgce | Pasadena | — | ◇ UNVERIFIED |
| SPStepan Pasadena | Pasadena | — | ◇ UNVERIFIED |
| SEStoller Enterprise | Houston | — | ◇ UNVERIFIED |
| SRSunoco R&m Bayport Polypropylene | Pasadena | — | ◇ UNVERIFIED |
| TDThe Dow Chemical Company | Deer Park | — | ◇ UNVERIFIED |
| TMThe Mundy Companies | Pasadena | — | ◇ UNVERIFIED |
| TCTnemec Company, INC. | Houston | — | ◇ UNVERIFIED |
| TPTotal Petrochemicals & Refining Usa, INC. | La Porte | — | ◇ UNVERIFIED |
| TSTsrc Specialty Materials R & D Lab | Katy | — | ◇ UNVERIFIED |
 Ultimate Linings | Houston | — | ◇ UNVERIFIED |
| UPUniversal Plant Services | Pasadena | — | ◇ UNVERIFIED |
| UGUtility Global | Houston | — | ◇ UNVERIFIED |
