| LFLancaster Furniture Company | Houston | — | ◇ UNVERIFIED |
| LILaurel Industries | La Porte | — | ◇ UNVERIFIED |
| LLLinde-clear Lake | Pasadena | — | ◇ UNVERIFIED |
| LMLindon Manufacturing & Laboratory | Houston | — | ◇ UNVERIFIED |
| MTMatheson Tri-gas INC | La Porte | — | ◇ UNVERIFIED |
| MCMuehlstein Compounded Products | Houston | — | ◇ UNVERIFIED |
| NINA Industries Pasadena | Seabrook | — | ◇ UNVERIFIED |
| NCNapco Chemical Co., INC. | Spring | — | ◇ UNVERIFIED |
| NGNatural Gas Odorizing, INC. | Baytown | — | ◇ UNVERIFIED |
| PMPasadena Methanol Plant | Pasadena | — | ◇ UNVERIFIED |
| PIPlexmar Incorporated | Houston | — | ◇ UNVERIFIED |
| PPolyone | Seabrook | — | ◇ UNVERIFIED |
| PCPolyone Corporation | Pasadena | — | ◇ UNVERIFIED |
| PPraxair | La Porte | — | ◇ UNVERIFIED |
| PEPrince Energy LLC | Houston | — | ◇ UNVERIFIED |
| PMPrince Minerals | Houston | — | ◇ UNVERIFIED |
| QCQuest Chemical CORP | Houston | — | ◇ UNVERIFIED |
| RMRavago Manufacturing Americas | Houston | — | ◇ UNVERIFIED |
| RARohm and Haas Chemicals Llc, Lone Star Plant | Deer Park | — | ◇ UNVERIFIED |
| SNSgs North America | Deer Park | — | ◇ UNVERIFIED |
| SCSmith Corrosion Services Incorporated | Houston | — | ◇ UNVERIFIED |
| SISongwon International Americas INC. - La Porte | La Porte | — | ◇ UNVERIFIED |
 South Coast Terminals Strang Road Facility | La Porte | — | ◇ UNVERIFIED |
| SCStarpak CORP | Houston | — | ◇ UNVERIFIED |
| SPStreamline Polymers | Houston | — | ◇ UNVERIFIED |
| SPSun Products Corporation Texas | Pasadena | — | ◇ UNVERIFIED |
| SUSyensqo USA LLC | Pasadena | — | ◇ UNVERIFIED |
 Syngenta Crop Protection - Bay Port Site | Pasadena | — | ◇ UNVERIFIED |
| TKTessenderlo Kerley INC | Pasadena | — | ◇ UNVERIFIED |
| TGThe Geon Company | Deer Park | — | ◇ UNVERIFIED |
| TCTotal Clean Pasadena Tank Wash | Pasadena | — | ◇ UNVERIFIED |
| UEUSA Environment | Pasadena | — | ◇ UNVERIFIED |
| VIVarn International, INC. | Houston | — | ◇ UNVERIFIED |
| VVerdia | Houston | — | ◇ UNVERIFIED |
| VMVibrantz Minerals | Houston | — | ◇ UNVERIFIED |
| WTWesthollow Technology Center | Houston | — | ◇ UNVERIFIED |
| WGW.r. Grace & CO. - Conn. Grace Construction Products | Houston | — | ◇ UNVERIFIED |
| ZSZach System | La Porte | — | ◇ UNVERIFIED |
| ALAir Liquide Large Industries - Bayport Complex | Pasadena | 20–99 | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc.- Laporte Facility | La Porte | 100–499 | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Operating Service Center (OSC) | Pasadena | 20–99 | ◐ LIKELY ACTIVE |
| ACAlbemarle Corporation- Clearlake | Houston | 20–99 | ◐ LIKELY ACTIVE |
| ASALTIVIA Specialty Chemicals, LLC | La Porte | 20–99 | ◐ LIKELY ACTIVE |
| ACAnnie & Chau LP | Houston | — | ◐ LIKELY ACTIVE |
| ABArtemis Bio-solutions, LLC | Houston | — | ◐ LIKELY ACTIVE |
| AWAustin Wood Recycling Inc. dba Texas Native Landscape Supply-Humble | Humble | 1–19 | ◐ LIKELY ACTIVE |
| ASAuto-Chlor Services #15 | Houston | 20–99 | ◐ LIKELY ACTIVE |
| BIBarradhesion INC. | Humble | — | ◐ LIKELY ACTIVE |
| BCBASF Crosspoint | Houston | 20–99 | ◐ LIKELY ACTIVE |
| BPBayport Polymers LLC dba Baystar | Pasadena | 100–499 | ◐ LIKELY ACTIVE |
