| SSupelco | Bellefonte | PA | — | ◐ LIKELY ACTIVE |
| SSSurface Specialties Incorporated | North Augusta | SC | — | ◐ LIKELY ACTIVE |
| SSSyensqo Specialty Polymers USA LLC | Marietta | OH | — | ◐ LIKELY ACTIVE |
| SSSyensqo Specialty Polymers Usa, LLC | Greenville | SC | — | ◐ LIKELY ACTIVE |
| SUSyensqo USA LLC | Baton Rouge | LA | 20–99 | ◐ LIKELY ACTIVE |
Syngenta Crop Protection, LLC. - St Gabriel Plant | Saint Gabriel | LA | — | ◐ LIKELY ACTIVE |
| TETaminco Eastman US - St Gabriel Plant | Saint Gabriel | LA | — | ◐ LIKELY ACTIVE |
| TUTaminco US LLC | Saint Gabriel | LA | 100–499 | ◐ LIKELY ACTIVE |
| TPTaro Plast US | Sterling Heights | MI | 20–99 | ◐ LIKELY ACTIVE |
| TLTate & Lyle Sucralose INC | Mc Intosh | AL | — | ◐ LIKELY ACTIVE |
| TATesoro Alaska Petroleum CO | Kenai | AK | — | ◐ LIKELY ACTIVE |
| TGTesoro Golden Eagle Refinery | Martinez | CA | — | ◐ LIKELY ACTIVE |
| TLTesoro Los Angeles Refinery and Calciner | Carson | CA | — | ◐ LIKELY ACTIVE |
| TCTexas City Crude Oil Terminal | Texas City | TX | — | ◐ LIKELY ACTIVE |
| TCThatcher Company of North Dakota INC | Glendive | MT | — | ◐ LIKELY ACTIVE |
| TDThe Dow Chemical CO - Louisiana Operations | Plaquemine | LA | — | ◐ LIKELY ACTIVE |
| TDThe Dow Chemical Company | Marietta | GA | — | ◐ LIKELY ACTIVE |
| TFThermo Fisher Scientific CO | Bridgewater | NJ | — | ◐ LIKELY ACTIVE |
| TFTitan Florida LLC | Medley | FL | — | ◐ LIKELY ACTIVE |
| TCTotalenergies Cray Valley - Beaumont | Beaumont | TX | — | ◐ LIKELY ACTIVE |
| TPTotalenergies Petrochemicals & Refining Usa, INC. - Carville Polystyrene Plant | Carville | LA | — | ◐ LIKELY ACTIVE |
| TPTotalenergies Petrochemicals & Refining USA INC - Cos-mar Styrene Monomer Plant | Carville | LA | — | ◐ LIKELY ACTIVE |
| TPTotal Petrochemicals & Refining USA INC | Deer Park | TX | — | ◐ LIKELY ACTIVE |
| THTrecora Hydrocarbons Combined Facility | Silsbee | TX | — | ◐ LIKELY ACTIVE |
| TRTricor Refining, LLC | Bakersfield | CA | — | ◐ LIKELY ACTIVE |
| TSTsrc Specialty Materials LLC - Research & Development Pilot Plant | Plaquemine | LA | — | ◐ LIKELY ACTIVE |
| UIUltramar INC Marine Terminal | Wilmington | CA | — | ◐ LIKELY ACTIVE |
| UCUnion Carbide Corporation, Institute Plant | Institute | WV | — | ◐ LIKELY ACTIVE |
| UCUnion Carbide CORP -so Charleston Fac. | South Charleston | WV | — | ◐ LIKELY ACTIVE |
| UCUnion Carbide CORP - St Charles Plant | Hahnville | LA | — | ◐ LIKELY ACTIVE |
| UCUnion Carbide CORP Technology Park | Charleston | WV | — | ◐ LIKELY ACTIVE |
| UCUnion Carbide Seadrift Cogen | Seadrift | TX | — | ◐ LIKELY ACTIVE |
| URUnited Refining Co/warren Plt | Warren | PA | — | ◐ LIKELY ACTIVE |
| UUUnivar USA INC - Bunola Facility | Bunola | PA | — | ◐ LIKELY ACTIVE |
| UNUp North Plastics INC | Cottage Grove | MN | 500+ | ◐ LIKELY ACTIVE |
| USU. S. Amines - Bucks Plant | Axis | AL | — | ◐ LIKELY ACTIVE |
| USU S Amines (portsmouth) L L C | Portsmouth | VA | — | ◐ LIKELY ACTIVE |
| UAUS Army Holston Army Ammunition Plant | Kingsport | TN | — | ◐ LIKELY ACTIVE |
| UDUS Doe Portsmouth Gaseous Diffusion Plant - Bwcs Duf6 | Piketon | OH | — | ◐ LIKELY ACTIVE |
| UMUS Magnesium Plant | Tooele | UT | — | ◐ LIKELY ACTIVE |
| UMUS Methanol Llc, Liberty One Methanol Plant | Nitro | WV | — | ◐ LIKELY ACTIVE |
| USUS Steel Mon Valley Works - Clairton Plant | Clairton | PA | — | ◐ LIKELY ACTIVE |
| VMValero Memphis Refinery | Memphis | TN | — | ◐ LIKELY ACTIVE |
| VRValero Renewable Fuels Company | Aurora | SD | — | ◐ LIKELY ACTIVE |
| VWValero Wilmington Asphalt Plant | Wilmington | CA | 20–99 | ◐ LIKELY ACTIVE |
| VEValicor Environmental Services | Dayton | OH | — | ◐ LIKELY ACTIVE |
| VCValspar Coatings | Garland | TX | — | ◐ LIKELY ACTIVE |
| VCVeckridge Chemical | Kearny | NJ | — | ◐ LIKELY ACTIVE |
| VNVeolia North America Regeneration Services | Linden | NJ | — | ◐ LIKELY ACTIVE |
| VNVeolia North America Regeneration Services, LLC (1431350817) | North Bend | OH | — | ◐ LIKELY ACTIVE |