| SSShin-Etsu Silicones of America, Inc. Evans 2 | Akron | OH | 20–99 | ◐ LIKELY ACTIVE |
| SUShpp US LLC | Mount Vernon | IN | — | ◐ LIKELY ACTIVE |
| SNSirmax North America | Anderson | IN | 20–99 | ◐ LIKELY ACTIVE |
| SPSk Primacor Americas | Freeport | TX | — | ◐ LIKELY ACTIVE |
| SLSkynano, LLC | Louisville | TN | — | ◐ LIKELY ACTIVE |
| SMSmith Meat Packing, Inc. | Port Huron | MI | — | ◐ LIKELY ACTIVE |
| SLSolenis, LLC | Wilmington | DE | — | ◐ LIKELY ACTIVE |
| SMSolugen Minetta Facility | Houston | TX | — | ◐ LIKELY ACTIVE |
| SMSoulbrain Mi Incorporated | Kokomo | IN | — | ◐ LIKELY ACTIVE |
Southern Ionics INC | Chickasaw | AL | — | ◐ LIKELY ACTIVE |
Southern Ionics Incorporated | Tuscaloosa | AL | — | ◐ LIKELY ACTIVE |
Southern Ionics Incorporated Tuscaloosa Facility | Tuscaloosa | AL | — | ◐ LIKELY ACTIVE |
| SCSpecialty Chemical | Quincy | FL | 20–99 | ◐ LIKELY ACTIVE |
| SPSpecialty Products Us, LLC - Polyox Plant | Institute | WV | — | ◐ LIKELY ACTIVE |
| SISprintray, INC. | Los Angeles | CA | — | ◐ LIKELY ACTIVE |
| SIStoropack, Inc. - Atlanta | Atlanta | GA | 1–19 | ◐ LIKELY ACTIVE |
| SIStoropack, Inc. - Edison | Edison | NJ | 1–19 | ◐ LIKELY ACTIVE |
| SSSumika Semiconductor Materials Texas | Baytown | TX | 20–99 | ◐ LIKELY ACTIVE |
| SCSummit Custom Spray Drying INC @ Flemington Ind Pk | Flemington | NJ | — | ◐ LIKELY ACTIVE |
| SPSunedison Polysilicon Facility | Pasadena | TX | — | ◐ LIKELY ACTIVE |
| SPSungro Products LLC | Los Angeles | CA | — | ◐ LIKELY ACTIVE |
| SASunlit Arizona LLC | Phoenix | AZ | 20–99 | ◐ LIKELY ACTIVE |
| SISunoco INC Eagle Point Refinery | Westville | NJ | — | ◐ LIKELY ACTIVE |
| SISunoco INC (r&m) Eagle Point Facility | Westville | NJ | — | ◐ LIKELY ACTIVE |
| SPSun Polymers | Mooresville | IN | 20–99 | ◐ LIKELY ACTIVE |
| TTTCI - Texarkana, INC | Nash | TX | 100–499 | ◐ LIKELY ACTIVE |
| TATeijin Automotive Technologies, Van Wert, Ohio | Van Wert | OH | 20–99 | ◐ LIKELY ACTIVE |
| TBTesoro - Barbers Point Marine Loading | Kapolei | HI | — | ◐ LIKELY ACTIVE |
| TLTesoro Logistics Operations Dig Site #8 | Salt Lake City | UT | — | ◐ LIKELY ACTIVE |
| TLTesoro Los Angeles Refinery and Sulfur Recovery Plant - Wilmington | Carson | CA | — | ◐ LIKELY ACTIVE |
| TRTesoro Refining and Marketing Co., LLC - Los Angeles Refinery | Wilmington | CA | — | ◐ LIKELY ACTIVE |
| TRTesoro Refining & Marketing - Carson Refinery | Carson | CA | — | ◐ LIKELY ACTIVE |
| TKTessenderlo Kerley | Dumas | TX | — | ◐ LIKELY ACTIVE |
| TRTextile Rubber & Chemical CO | Dalton | GA | — | ◐ LIKELY ACTIVE |
| TCThe Chemours Company FC, LLC - La Porte | La Porte | TX | 100–499 | ◐ LIKELY ACTIVE |
| TDThe Doe Run Company | Boss | MO | 100–499 | ◐ LIKELY ACTIVE |
| TLThe Lubrizol Corporation | Painesville | OH | — | ◐ LIKELY ACTIVE |
| TFThermo Fisher Scientific | Bedford | MA | — | ◐ LIKELY ACTIVE |
| TSThe San Antonio Refinery | San Antonio | TX | — | ◐ LIKELY ACTIVE |
| TSThe San Antonio Refinery LLC | San Antonio | TX | — | ◐ LIKELY ACTIVE |
| TIToncee Incorporated | Smyrna | GA | — | ◐ LIKELY ACTIVE |
| TFTownley Foundry & Machine Company, INC | Candler | FL | 100–499 | ◐ LIKELY ACTIVE |
| TCTrans Carolina Products, LLC | Hamlet | NC | — | ◐ LIKELY ACTIVE |
| TFTredegar Film Prod Inc/pottsville | Mar Lin | PA | — | ◐ LIKELY ACTIVE |
| TLTronox LLC | Hamilton | MS | — | ◐ LIKELY ACTIVE |
| ULUct, LLC | Lewistown | PA | — | ◐ LIKELY ACTIVE |
| UCUnion Carbide Corporation | Woodbine | GA | — | ◐ LIKELY ACTIVE |
| UCUnion Carbide Corporation-institute | Institute | WV | 20–99 | ◐ LIKELY ACTIVE |
| UDUnited-erie Division of Icc, INC | Erie | PA | — | ◐ LIKELY ACTIVE |
| UEUniversal Environmental Services, LLC | Peachtree City | GA | — | ◐ LIKELY ACTIVE |