| TKTessenderlo Kerley INC | Fresno | CA | — | ◇ UNVERIFIED |
| TATetra Arkansas Project LLC - Tetra Arkansas Project - Evergreen Plant | Stamps | AR | — | ◇ UNVERIFIED |
| TATetra Arkansas Project LLC - Tetra Arkansas Project LLC - Evergreen #2 | Magnolia | AR | — | ◇ UNVERIFIED |
| TCTetra Chemicals | Westlake | LA | — | ◇ UNVERIFIED |
| TTTetra Technologies INC | El Dorado | AR | — | ◇ UNVERIFIED |
| TTTetra Technologies, INC. | Havertown | PA | — | ◇ UNVERIFIED |
| TRTextile Rubber & Chemical CO | Dalton | GA | — | ◇ UNVERIFIED |
| TPThacker Pass/kings River Valley Lithium Project | Orovada | NV | — | ◇ UNVERIFIED |
| TCThatcher Chemical of Florida INC | Palmetto | FL | — | ◇ UNVERIFIED |
 Thatcher Company of California, INC. - Stockton | Stockton | CA | — | ◇ UNVERIFIED |
| TCThatcher Company of Montana | Missoula | MT | — | ◇ UNVERIFIED |
| TCThe Chemours Company | Fremont | CA | — | ◇ UNVERIFIED |
| TLThe Lewis Chemical CO. | Rome | GA | — | ◇ UNVERIFIED |
| TTThe Terra Firma Company C/o Weber Logistics | Chino | CA | — | ◇ UNVERIFIED |
| TPTiger-sul Products LLC | Stockton | CA | — | ◇ UNVERIFIED |
| TCTokai Carbon Cb | Long Beach | CA | — | ◇ UNVERIFIED |
| TIToledo Industrial Center Company | Toledo | OH | — | ◇ UNVERIFIED |
| TCTrabuco Canyon Waterdistrict | Lake Forest | CA | — | ◇ UNVERIFIED |
| TITranschem Industries INC. | Fayetteville | GA | — | ◇ UNVERIFIED |
| TITrichromatic-west, INC | Bell | CA | — | ◇ UNVERIFIED |
| TPTric Plant | Mccarran | NV | — | ◇ UNVERIFIED |
| TLTronox LLC | Henderson | NV | — | ◇ UNVERIFIED |
| UAUbe America INC. | Berkeley | CA | — | ◇ UNVERIFIED |
| USUdm Systems LLC | Raleigh | NC | — | ◇ 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 |
| USUnited States Doe - Savannah River Site Managed and Operated By Srns, LLC | Aiken | SC | — | ◇ UNVERIFIED |
| UPUniversal Plant Services | Pasadena | TX | — | ◇ UNVERIFIED |
| ULUop LLC | Baton Rouge | LA | — | ◇ UNVERIFIED |
| UUUrenco USA | Eunice | NM | — | ◇ UNVERIFIED |
| UDUsalco/ Delta Chemical CORP | Ashtabula | OH | — | ◇ UNVERIFIED |
| ULUsalco Little Rock Plant, LLC | Little Rock | AR | — | ◇ UNVERIFIED |
| UMUsalco Michigan City Plant, LLC | Michigan City | IN | — | ◇ UNVERIFIED |
| UPUsalco Port Allen Plant LLC | Port Allen | LA | — | ◇ UNVERIFIED |
| UAU.s. Army Redstone Arsenal | Redstone Arsenal | AL | — | ◇ UNVERIFIED |
| UDUS Department of the Treasury | Oakland | CA | — | ◇ UNVERIFIED |
| UEUS Enrichment CORP Paducah Gaseous Diffusion Plant | Paducah | KY | — | ◇ UNVERIFIED |
| USUtica Silicates Plt | Utica | IL | — | ◇ UNVERIFIED |
| VPValue Products INC | Stockton | CA | — | ◇ UNVERIFIED |
| VCVanchlor CO INC | Lockport | NY | — | ◇ UNVERIFIED |
| VCVenator Chemicals LLC | Harrisburg | NC | — | ◇ UNVERIFIED |
| VCVenture Chemical INC. | Seagraves | TX | — | ◇ UNVERIFIED |
| WWWalters Wholesale Electric | Brea | CA | — | ◇ UNVERIFIED |
| WWWalworth Woodcraft INC | Walworth | WI | — | ◇ UNVERIFIED |
| WAWastewater Acquisition, LLC | Wood Dale | IL | — | ◇ UNVERIFIED |
| WWebseeds | Englewood | CO | — | ◇ UNVERIFIED |
| WEWestinghouse Electric:columbia | Columbia | SC | — | ◇ UNVERIFIED |
| WSWest Salem Packaging | West Salem | OH | — | ◇ UNVERIFIED |
| WAWestwood Aerogel CO | San Leandro | CA | — | ◇ UNVERIFIED |
| WMWilkinson Minerals, LLC | Bay City | MI | — | ◇ UNVERIFIED |
| WPWilson Property Holdings LLC | Duncan | SC | — | ◇ UNVERIFIED |
| WTWinslow Tanker Base | Winslow | AZ | — | ◇ UNVERIFIED |
| WCWood Care Systems | Kirkland | WA | — | ◇ UNVERIFIED |
| WGW.r. Grace | East Chicago | IN | — | ◇ UNVERIFIED |
| WRW R Grace & CO Conn | Columbia | MD | — | ◇ UNVERIFIED |
| WRW R Grace & CO - Conn - Super High Activity Catalyst Plant | Norco | LA | — | ◇ UNVERIFIED |
| ZIZircon Industries | Cleveland | OH | — | ◇ UNVERIFIED |
