| ACAfton Chemical Corporation | Pasadena | 100–499 | ● ACTIVE |
| APAir Products Port Arthur | Port Arthur | 20–99 | ● ACTIVE |
| AIArrow-magnolia, International, INC. | Dallas | 20–99 | ● ACTIVE |
| BOBaytown Olefins Plant | Baytown | 100–499 | ● ACTIVE |
Benuvia Operations, LLC | Round Rock | 20–99 | ● ACTIVE |
Berryman Products, INC. | Arlington | — | ● ACTIVE |
Cerilliant Corporation | Round Rock | 100–499 | ● ACTIVE |
| CBChemicals Bay City Site | Bay City | 20–99 | ● ACTIVE |
| CRChemtrade Refinery Services | Beaumont | 20–99 | ● ACTIVE |
| CPChevron Phillips Chemical Orange Polyethylene Plant | Orange | 100–499 | ● ACTIVE |
| CPChevron Phillips Chemical Sweeny Old Ocean Facilities | Sweeny | 500+ | ● ACTIVE |
| CCContinental Carbon Sunray Plant | Sunray | 20–99 | ● ACTIVE |
Control Solutions | Pasadena | 100–499 | ● ACTIVE |
| DEDegussa Engineered Carbons Echo Carbon Plant | Orange | 20–99 | ● ACTIVE |
Dixie Chemical Company, INC. | Pasadena | 100–499 | ● ACTIVE |
Eastman Chemical Company, Texas Operations | Longview | 500+ | ● ACTIVE |
| ESEco Services Operations, LLC. , Baytown Plant | Baytown | 20–99 | ● ACTIVE |
| EUExpal USA INC -texarkana | Hooks | 20–99 | ● ACTIVE |
| FPFormosa Plastics Corporation, Texas | Point Comfort | 500+ | ● ACTIVE |
| FIFritz Industries | Mesquite | 100–499 | ● ACTIVE |
| GPGrace Pasadena Catalyst Site | Pasadena | 100–499 | ● ACTIVE |
Helena Laboratories Corporation | Beaumont | — | ● ACTIVE |
| HCHouston Chemical Plant | Houston | 1–19 | ● ACTIVE |
Ifs Coatings INC | Gainesville | 100–499 | ● ACTIVE |
| KNKaneka North America LLC | Pasadena | 100–499 | ● ACTIVE |
Lone Star Specialty Products, LLC | Lone Star | — | ● ACTIVE |
| LCLyondell Chemical - Bayport Plant | Pasadena | 100–499 | ● ACTIVE |
| LCLyondell Chemical Channelview | Channelview | 500+ | ● ACTIVE |
Monument Chemical Houston LLC | Houston | 100–499 | ● ACTIVE |
Monument Chemical Port Arthur, LLC | Port Arthur | 20–99 | ● ACTIVE |
| NCNippon Chemical Texas INC | Pasadena | 100–499 | ● ACTIVE |
Norit Americas, INC | Marshall | 20–99 | ● ACTIVE |
| OIOcusoft INC. | Rosenberg | 20–99 | ● ACTIVE |
Owen Oil Tools LP | Godley | 100–499 | ● ACTIVE |
Photronics Texas Allen, INC. | Allen | 100–499 | ● ACTIVE |
Poole Chemical Co., INC. | Texline | — | ● ACTIVE |
| QCQuestvapco Corporation | Brenham | 100–499 | ● ACTIVE |
| RCRicca Chemical | Arlington | 20–99 | ● ACTIVE |
| RARohm and Haas Chemicals Bayport | La Porte | 100–499 | ● ACTIVE |
| SCSasol Chemicals - Greens Bayou Plant | Houston | 20–99 | ● ACTIVE |
| SPSeatex - Pasadena | Pasadena | 20–99 | ● ACTIVE |
Summit Refrigerants, LLC | Humble | 20–99 | ● ACTIVE |
| TLThe Lubrizol CORP - Deer Park Plant | Deer Park | 500+ | ● ACTIVE |
| TLThe Lubrizol Corporation, Bayport Plant | Pasadena | 100–499 | ● ACTIVE |
| UCUmicore Catalyst USA | Pasadena | 20–99 | ● ACTIVE |
A-brite Company | Garland | — | ● ACTIVE |
Advanced Refrigerant Technologies LLC | League City | — | ● ACTIVE |
Allens Nutech INC | Tyler | 20–99 | ● ACTIVE |
Altrazeal Life Sciences INC | Addison | — | ● ACTIVE |
Bio-synthesis, INC. | Lewisville | — | ● ACTIVE |