| SRSummit Research Labs, INC. | Middletown | NY | — | ◇ UNVERIFIED |
 Sun Chemical CORP | Williamsport | MD | — | ◇ UNVERIFIED |
| SPSunedison Polysilicon Facility | Pasadena | TX | — | ◇ UNVERIFIED |
| SASunlit Arizona LLC | Phoenix | AZ | — | ◇ UNVERIFIED |
| SLSuperior Lime & Chemical | Phoenix | AZ | — | ◇ UNVERIFIED |
| SMSuperior Manufacturing Group INC | Chicago | IL | — | ◇ UNVERIFIED |
| SMSuperior Manufacturing LLC | Madison Heights | MI | — | ◇ UNVERIFIED |
| STSuperior Tote Solutions | Summitville | IN | — | ◇ UNVERIFIED |
| SSSw Shattuck Chemical CO INC | Denver | CO | — | ◇ UNVERIFIED |
| SCSynthio Chemicals | Broomfield | CO | — | ◇ UNVERIFIED |
| THTae Hee CO. | Santa Cruz | CA | — | ◇ UNVERIFIED |
| TMTapic Metal Polishing | Hawthorne | CA | — | ◇ UNVERIFIED |
| TITaylor Industries LLC | Madison | MS | — | ◇ UNVERIFIED |
| TSTcs Service, INC. | Raleigh | NC | — | ◇ UNVERIFIED |
| TLTdc LLC - Westlake Plant | Westlake | LA | — | ◇ UNVERIFIED |
| TCTek Chemical Site | Portland | OR | — | ◇ UNVERIFIED |
| TTerralithium | Brawley | CA | — | ◇ UNVERIFIED |
| TRTesoro Refining and Marketing Co, LLC | Carson | CA | — | ◇ UNVERIFIED |
| TKTessenderlo Kerley | Dumas | TX | — | ◇ UNVERIFIED |
| 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 |
| TGTexas Gulf Industries, INC. | Baltimore | MD | — | ◇ 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 |
| TCThe Clorox CO | Vernon | CA | — | ◇ UNVERIFIED |
| TCThe Clorox Company | Pleasanton | CA | — | ◇ UNVERIFIED |
| TCThe Clorox Company | Jacksonville | TX | — | ◇ UNVERIFIED |
| TLThe Lewis Chemical CO. | Rome | GA | — | ◇ UNVERIFIED |
| TOTherm O Rock INC - New Eagle Plant | New Eagle | PA | — | ◇ UNVERIFIED |
| TTThe Terra Firma Company C/o Weber Logistics | Chino | CA | — | ◇ UNVERIFIED |
| TCThetford CORP | Ann Arbor | MI | — | ◇ 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 |
| TSTri Sect Corporation | Schaumburg | IL | — | ◇ UNVERIFIED |
| TWTrison Wells, LLC | Walterboro | SC | — | ◇ UNVERIFIED |
| TLTronox LLC | Henderson | NV | — | ◇ UNVERIFIED |
| TCTucker's Cleaners | Dallas | TX | — | ◇ UNVERIFIED |
 U-2 Clean Products, LLC | Stockbridge | GA | — | ◇ 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 |
| UMUmi Metalfab | Menomonee Falls | WI | — | ◇ UNVERIFIED |
| UCUnelko Corporation | Phoenix | AZ | — | ◇ UNVERIFIED |
| USUnited Stated Postal Service | San Mateo | CA | — | ◇ 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 |
| UPUSA Packaging Division of Nch | Irving | TX | — | ◇ 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 |
| UTUS Technology Recycling CORP | Canton | OH | — | ◇ UNVERIFIED |
| USUtica Silicates Plt | Utica | IL | — | ◇ UNVERIFIED |
| VPValue Products INC | Stockton | CA | — | ◇ UNVERIFIED |
| VCVanchlor CO INC | Lockport | NY | — | ◇ UNVERIFIED |
| VTVapor Technologies INC | Boulder | CO | — | ◇ UNVERIFIED |
| VCVenator Chemicals LLC | Harrisburg | NC | — | ◇ UNVERIFIED |
| VCVenture Chemical INC. | Seagraves | TX | — | ◇ UNVERIFIED |
| VLVenus Labs INC | Opa Locka | FL | — | ◇ UNVERIFIED |
| VPVictorville - Police Department | Victorville | CA | — | ◇ UNVERIFIED |
| WWWalters Wholesale Electric | Brea | CA | — | ◇ UNVERIFIED |
| WWWalworth Woodcraft INC | Walworth | WI | — | ◇ UNVERIFIED |
| WAWastewater Acquisition, LLC | Wood Dale | IL | — | ◇ UNVERIFIED |
| WWebseeds | Englewood | CO | — | ◇ UNVERIFIED |
| WCWesmar Company Site | Seattle | WA | — | ◇ UNVERIFIED |
| WEWestinghouse Electric:columbia | Columbia | SC | — | ◇ UNVERIFIED |
| WSWest Salem Packaging | West Salem | OH | — | ◇ UNVERIFIED |
| WVWest Valley Sanitation District of Santa Clara County | Campbell | CA | — | ◇ UNVERIFIED |
| WAWestwood Aerogel CO | San Leandro | CA | — | ◇ UNVERIFIED |
| WGWhyte Gate INC | Round Lake | IL | — | ◇ UNVERIFIED |
| WMWilkinson Minerals, LLC | Bay City | MI | — | ◇ UNVERIFIED |
| WPWilson Property Holdings LLC | Duncan | SC | — | ◇ UNVERIFIED |
| WEWincup El Campo | El Campo | TX | — | ◇ UNVERIFIED |
| WTWinslow Tanker Base | Winslow | AZ | — | ◇ UNVERIFIED |
| WIWolf Industries Inc | Buffalo | MN | — | ◇ UNVERIFIED |
| WCWonder Chemical CORP | Fairless Hills | PA | — | ◇ UNVERIFIED |
| WCWonder Cleaning Products LLC | Monroe Township | NJ | — | ◇ UNVERIFIED |
| WCWood Care Systems | Kirkland | WA | — | ◇ UNVERIFIED |
| WLWorld Laboratories, LTD | Sun Valley | CA | — | ◇ UNVERIFIED |
