| TSTorch Surface Technologies | Whitmore Lake | MI | — | ◐ LIKELY ACTIVE |
| TMTroy Manufacturing INC | Burton | OH | — | ◐ LIKELY ACTIVE |
| TSTsrc Specialty Materials LLC - Research & Development Pilot Plant | Plaquemine | LA | — | ◐ LIKELY ACTIVE |
| TRTwinco Romax | Milwaukee | WI | — | ◐ LIKELY ACTIVE |
| TBTwist Bioscience | Wilsonville | OR | — | ◐ LIKELY ACTIVE |
| ULUnited Laboratories Manufacturing | Carrollton | TX | 100–499 | ◐ LIKELY ACTIVE |
| USUnivar Solutions Usa, LLC. Fka Dpc Enterprises, LP | Chattanooga | TN | — | ◐ LIKELY ACTIVE |
| UUUnivar USA INC - Bunola Facility | Bunola | PA | — | ◐ LIKELY ACTIVE |
| ULUpsher-smith Laboratories LLC | Maple Grove | MN | 100–499 | ◐ 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 |
| UAUS Army Pine Bluff Arsenal | Pine Bluff | AR | — | ◐ LIKELY ACTIVE |
| USU S Doe Pantex Plant | Panhandle | TX | — | ◐ LIKELY ACTIVE |
| UDUS Doe Portsmouth Gaseous Diffusion Plant - Bwcs Duf6 | Piketon | OH | — | ◐ LIKELY ACTIVE |
| UDUS Doe Savannah River Site | Aiken | SC | — | ◐ LIKELY ACTIVE |
| UMUS Methanol Llc, Liberty One Methanol Plant | Nitro | WV | — | ◐ LIKELY ACTIVE |
| ULUspharma Ltd, CO. | Miami Lakes | FL | — | ◐ LIKELY ACTIVE |
| VEValicor Environmental Services | Dayton | OH | — | ◐ 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 |
| VRVeolia - Red Lion Plant | New Castle | DE | — | ◐ LIKELY ACTIVE |
| VIVerla International | New Windsor | NY | 100–499 | ◐ LIKELY ACTIVE |
| VTVibrantz Technologies | Curtis Bay | MD | — | ◐ LIKELY ACTIVE |
| VTVibrantz Technologies (1318170235) | Cleveland | OH | — | ◐ LIKELY ACTIVE |
| VIVigon International LLC | East Stroudsburg | PA | 100–499 | ◐ LIKELY ACTIVE |
| VCViridis Chemical | Columbus | NE | — | ◐ LIKELY ACTIVE |
| VIVvf Illinois Services LLC | Montgomery | IL | 100–499 | ◐ LIKELY ACTIVE |
| WCWako Chemicals USA INC | Richmond | VA | — | ◐ LIKELY ACTIVE |
| WPWalex Products Company, INC. | Leland | NC | 20–99 | ▲ REPORTED CLOSED |
| WPWeiman Products LLC | Gurnee | IL | 100–499 | ◐ LIKELY ACTIVE |
Western Dubuque Biodiesel, LLC | Farley | IA | — | ◐ LIKELY ACTIVE |
| WEWestinghouse Electric Company Llc/columbia Fuel Fabrication Facility | Hopkins | SC | — | ◐ LIKELY ACTIVE |
| WCWestlake Chemicals & Vinyls LLC | Aberdeen | MS | — | ◐ LIKELY ACTIVE |
| WUWestlake US 2 LLC | Longview | WA | — | ◐ LIKELY ACTIVE |
| WMWhite Mountain Imaging | Concord | NH | — | ◐ LIKELY ACTIVE |
| WRWhite River Energetics, LLC | Des Arc | AR | — | ◐ LIKELY ACTIVE |
| WLWilbara LLC | Wilmington | NC | — | ◐ LIKELY ACTIVE |
| WIWincom INC | Cincinnati | OH | 20–99 | ◐ LIKELY ACTIVE |
| WFWoodward Faclty | Woodward | OK | — | ◐ LIKELY ACTIVE |
| WRWorld Resources Company | Tolleson | AZ | — | ◐ LIKELY ACTIVE |
| WRW. R. Grace & CO - Conn | Baton Rouge | LA | 100–499 | ◐ LIKELY ACTIVE |
| WRW. R. Grace & CO. - Conn. | Chattanooga | TN | — | ◐ LIKELY ACTIVE |
| WEWright Enrichment INC. | Crowley | LA | 20–99 | ◐ LIKELY ACTIVE |
| XCXerox Corporation | Webster | NY | — | ◐ LIKELY ACTIVE |
| AIAc&s INC | Nitro | WV | — | ◐ LIKELY ACTIVE |
| ARAerc Recycling Solutions a Clean Earth CO | Allentown | PA | — | ◐ LIKELY ACTIVE |
| ATAgilent Technologies INC - Frederick Nasd | Frederick | CO | — | ◐ LIKELY ACTIVE |
| ACAgilyx Corporation | Tigard | OR | — | ◐ LIKELY ACTIVE |