| ACAfton Chemical Corporation | Pasadena | 100–499 | ● ACTIVE |
| BOBaytown Olefins Plant | Baytown | 100–499 | ● ACTIVE |
| EBExxonmobil Baytown Refinery | Baytown | 500+ | ● ACTIVE |
| HRHouston Refinery | Houston | 100–499 | ● ACTIVE |
| HRHouston Refining LP | Houston | 100–499 | ● ACTIVE |
Monument Chemical Houston LLC | Houston | 100–499 | ● ACTIVE |
South Coast Terminals, LLC | Houston | — | ● ACTIVE |
Ampd Labs, INC. | Houston | — | ● ACTIVE |
Bunker One (usa) INC. | Houston | — | ● ACTIVE |
Capital Gas Logistics & Oil Field Services INC | Spring | — | ● ACTIVE |
Exxon Mobil Corporation | Spring | — | ● ACTIVE |
Global Polychem LLC | Houston | — | ● ACTIVE |
Inevitable Solutions, LLC | Houston | — | ● ACTIVE |
| LELazarus Energy Holdings LLC | Houston | — | ● ACTIVE |
Marquart Ip LLC | Houston | — | ● ACTIVE |
Promecav INC | Houston | — | ● ACTIVE |
Shell Marine Products (us) Company | Houston | — | ● ACTIVE |
T. S. Moly-lubricants, INC | Houston | — | ● ACTIVE |
Vitol Aviation CO | Houston | — | ● ACTIVE |
| PRPetromax Refining Company, LLC | Houston | — | ◐ LIKELY ACTIVE |
| TWTrecora Wax LLC | Pasadena | 100–499 | ◐ LIKELY ACTIVE |
| VDValvoline Deer Park | Deer Park | 100–499 | ◐ LIKELY ACTIVE |
| BTBaytown Terminal | Baytown | — | ◐ LIKELY ACTIVE |
| KSKmcc Splitter Facility | Galena Park | — | ◐ LIKELY ACTIVE |
| PRPasadena Refining System, INC. | Pasadena | — | ◐ LIKELY ACTIVE |
| SCShell Chemical | Deer Park | — | ◐ LIKELY ACTIVE |
| ELEquilon Lubricants CO - Deer Park | Deer Park | — | ◐ LIKELY ACTIVE |
| VEVep Environmental | Galena Park | — | ◐ LIKELY ACTIVE |
| CTChannelview Texas Plant | Channelview | — | ◇ UNVERIFIED |
| HPHanson Pipe & Products INC Jersey Village | Houston | — | ◇ UNVERIFIED |
| HPHighlands Plant | Highlands | — | ◇ UNVERIFIED |
| MAMartin Asphalt-south Houston | South Houston | — | ◇ UNVERIFIED |
| MLMega Lubricants Facility | Houston | — | ◇ UNVERIFIED |
| CACentury Asphalt - Houston Plant | Houston | — | ◐ LIKELY ACTIVE |
| SMSolugen Minetta Facility | Houston | — | ◐ LIKELY ACTIVE |
| SHSouth Houston Asphalt | South Houston | 20–99 | ◐ LIKELY ACTIVE |
| AAAmerican Acryl | Pasadena | — | ◐ LIKELY ACTIVE |
| ISIntergulf - Strang Rd Facility | La Porte | — | ◐ LIKELY ACTIVE |
| PCPetroleum Coke Grinding INC | Houston | — | ◐ LIKELY ACTIVE |
| SCSouth Coast Terminals | La Porte | — | ◐ LIKELY ACTIVE |
| BPBayport Plant | Pasadena | — | ◇ UNVERIFIED |
| CCCamo Chemical | Houston | — | ◇ UNVERIFIED |
| CCCemex Construction Materials Houston Llc-humble Plant | Humble | — | ◇ UNVERIFIED |
| CCChampion Coatings | Houston | — | ◇ UNVERIFIED |
| CGChannel Greenhunter Biorefinery and Terminals | Houston | — | ◇ UNVERIFIED |
| DHDow Haltermann Plant 2 | Channelview | — | ◇ UNVERIFIED |
| GPGalena Park Yard | Galena Park | — | ◇ UNVERIFIED |
| HCHartree Channelview - Suite B | Channelview | — | ◇ UNVERIFIED |
| HSHenry Sealants Division | Houston | — | ◇ UNVERIFIED |
| HCHoover Circular Solutions Houston | Houston | — | ◇ UNVERIFIED |