| TCTetra Chemicals | Westlake | LA | — | ◇ UNVERIFIED |
| TFTexas Fluorescence Laboratories | Austin | TX | — | ◇ UNVERIFIED |
| TITexas International Refining | Galveston | TX | — | ◇ UNVERIFIED |
| TCThatcher Chemical of Florida INC | Palmetto | FL | — | ◇ UNVERIFIED |
 Thatcher Company of California, INC. - Stockton | Stockton | CA | — | ◇ UNVERIFIED |
| TDThe Dow Chemical CO | Joliet | IL | — | ◇ UNVERIFIED |
| TDThe Dow Chemical Company | Magnolia | AR | — | ◇ UNVERIFIED |
| TGThe Geon Company | Deer Park | TX | — | ◇ UNVERIFIED |
| TIThe International Group INC | Richmond | CA | — | ◇ UNVERIFIED |
| TLThe Lewis Chemical CO. | Rome | GA | — | ◇ UNVERIFIED |
| TMThe Marbleworks | North Port | FL | — | ◇ UNVERIFIED |
| TLTheodor Leonhard Wax Company, INC. | Haledon | NJ | — | ◇ UNVERIFIED |
| TPThe P D George Company | Fort Wayne | IN | — | ◇ UNVERIFIED |
| TPThermedics Polymer Products | Woburn | MA | — | ◇ UNVERIFIED |
| TFThermo Fisher Scientific | Bedford, Town of | MA | — | ◇ UNVERIFIED |
| TFThermo Fluids INC. White City | White City | OR | — | ◇ UNVERIFIED |
| TPThermoplastic Processes INC | Stirling | NJ | — | ◇ UNVERIFIED |
| TETherm-o-rock East INC | Donora | PA | — | ◇ UNVERIFIED |
| TWThe Whitaker Company | Spartanburg | SC | — | ◇ UNVERIFIED |
| TSThomas Swan Opelika, INC. | Opelika | AL | — | ◇ UNVERIFIED |
| TCThree Creek Bioenergy | Sheffield | OH | — | ◇ UNVERIFIED |
| TLTicona LLC | Summit | NJ | — | ◇ UNVERIFIED |
| TPTicona Polymers, INC. | Bishop | TX | — | ◇ UNVERIFIED |
| TPTicona Polymers, INC. | Lebanon | TN | — | ◇ UNVERIFIED |
| TOTidelands Oil Production Company Etal | Long Beach | CA | — | ◇ UNVERIFIED |
| TTTin Technology & Refining | West Chester | PA | — | ◇ UNVERIFIED |
| TCTonolli CORP. | Nesquehoning | PA | — | ◇ UNVERIFIED |
| TCTotal Clean Pasadena Tank Wash | Pasadena | TX | — | ◇ UNVERIFIED |
| TFToxguard Fluid Technologies INC | Stanton | CA | — | ◇ UNVERIFIED |
| TZTrace Zero INC | Auburn Hills | MI | — | ◇ UNVERIFIED |
| TSTrelleborg Sealing Solutions US INC | Elk Rapids | MI | — | ◇ UNVERIFIED |
| TRTricor Refining LLC | Bakersfield | CA | — | ◇ UNVERIFIED |
| TCTrimont Chemicals INC | Peabody | MA | — | ◇ UNVERIFIED |
| TLTrinseo LLC (p1025) | Midland | MI | — | ◇ UNVERIFIED |
| TPTri-state Plant Food | Dothan | AL | — | ◇ UNVERIFIED |
| TCTwentyfirst Century Biochemic | Marlborough | MA | — | ◇ UNVERIFIED |
| TSTwin State, Inc.- Durant | Durant | IA | — | ◇ UNVERIFIED |
| TBTwist Bioscience | Wilsonville | OR | — | ◇ UNVERIFIED |
| URUcar Resinas Caribe INC. | Bayamon | PR | — | ◇ UNVERIFIED |
| UTUltra Tech Extrusions of Tennessee INC. | Rocky Top | TN | — | ◇ UNVERIFIED |
| UAUmicore Autocat USA INC | Catoosa | OK | — | ◇ UNVERIFIED |
| UCUmicore Cobalt & Energy Products | Maxton | NC | — | ◇ UNVERIFIED |
| UPUmicore Precious Metals Chemistry (pmc) USA LLC | Catoosa | OK | — | ◇ UNVERIFIED |
| USUmicore Specialty Chemicals - Arab Facility | Arab | AL | — | ◇ UNVERIFIED |
| UMUncas Manufacturing____oob. | Providence | RI | — | ◇ UNVERIFIED |
| UNUnc Naval Products | Norwich | CT | — | ◇ UNVERIFIED |
| ULUnifi-kinston LLC | Kinston | NC | — | ◇ UNVERIFIED |
| UCUnion Carbide Corporation - Ucar Emulsion Systems | Garland | TX | — | ◇ UNVERIFIED |
| UCUnion Carbide CORP Tucker Latex Plant | Tucker | GA | — | ◇ UNVERIFIED |
| UBUnited Biofuels INC - 435 Greenpoint Ave | Brooklyn | NY | — | ◇ UNVERIFIED |
