| 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 |
Universal Plastics - Middlefield (0228000127) | Middlefield | OH | — | ◐ LIKELY ACTIVE |
| UAU.s. Agri-chemicals Corporation | Fort Meade | FL | — | ◐ LIKELY ACTIVE |
| UAU.s. Army Redstone Arsenal | Redstone Arsenal | AL | — | ◐ LIKELY ACTIVE |
| UEUS Enrichment CORP Paducah Gaseous Diffusion Plant | Paducah | KY | — | ◐ LIKELY ACTIVE |
| URUsepa Region Ii Philis Analytical Portable Laboratory Apl02 & Spa01 | Edison | NJ | — | ◐ LIKELY ACTIVE |
| UOUS Oil and Refining CO Marine Terminal | Tacoma | WA | — | ◐ LIKELY ACTIVE |
| UOUS Oil & Refining CO | Tacoma | WA | — | ◐ LIKELY ACTIVE |
| VBValero Benicia Asphalt Plant | Benicia | CA | — | ◐ LIKELY ACTIVE |
| VMValero McKee Refinery | Sunray | TX | 100–499 | ◐ LIKELY ACTIVE |
| VOValero Olympic Tank Farm | Wilmington | CA | — | ◐ LIKELY ACTIVE |
| VVValley View Industries INC | Crestwood | IL | 20–99 | ◐ LIKELY ACTIVE |
| VCVanderbilt Chemicals, LLC - Murray, KY | Murray | KY | 20–99 | ◐ LIKELY ACTIVE |
| VCVenator Chemicals LLC | Harrisburg | NC | — | ◐ LIKELY ACTIVE |
| VWVeolia Water North America Operating Services LLC - Chalmette Facility | Chalmette | LA | — | ◐ LIKELY ACTIVE |
| VOVertex Oil Swap (vrtxsw) - Marrero Terminal | Marrero | LA | — | ◐ LIKELY ACTIVE |
| VAVulcan Asphalt Company | Cordova | AL | — | ◐ LIKELY ACTIVE |
| WVWabash Valley Resources LLC | West Terre Haute | IN | — | ◐ LIKELY ACTIVE |
| WHW.a. Hammond Drierite Co, Limited | Xenia | OH | — | ◐ LIKELY ACTIVE |
| WWWalworth Woodcraft INC | Walworth | WI | — | ◐ LIKELY ACTIVE |
| WEWater Engineering, INC. | Mead | NE | — | ◐ LIKELY ACTIVE |
| WMWayne Manufacturing Industries, LLC | Brentwood | NH | — | ◐ LIKELY ACTIVE |
| WCWestlake Chemicals and Vinyls, LLC | Plaquemine | LA | 100–499 | ◐ LIKELY ACTIVE |
| WRWestlake Royal Building Products Bristol | Bristol | TN | 100–499 | ◐ LIKELY ACTIVE |
| WRWestlake Royal Building Products Marion | Marion | VA | 100–499 | ◐ LIKELY ACTIVE |
| WPWilliams Petroleum Serv.-augusta | Augusta | KS | — | ◐ LIKELY ACTIVE |
| WWincup | Lexington | MO | — | ◐ LIKELY ACTIVE |
| WLW. L. Gore & Associates, INC. - Elk Mills 1 | Elkton | MD | — | ◐ LIKELY ACTIVE |
| WLWmc LLC | Greenville | MI | — | ◐ LIKELY ACTIVE |
| WLWolf Lake Terminals, INC. | Hammond | IN | — | ◐ LIKELY ACTIVE |
| WIWoodward Iodine Corporation | Woodward | OK | 20–99 | ◐ LIKELY ACTIVE |
| WGW.r. Grace | East Chicago | IN | — | ◐ LIKELY ACTIVE |
| WGWR Grace - FCMS Tyrone Site | Tyrone | PA | 100–499 | ◐ LIKELY ACTIVE |
| ZIZeneca INC. | Mount Pleasant | TN | — | ◐ LIKELY ACTIVE |
| ZEZenith Energy Terminals Holdings LLC - Portland Terminal | Portland | OR | — | ◐ LIKELY ACTIVE |
| ZRZinc Resources | Victoria | TX | — | ◐ LIKELY ACTIVE |
| 1W100 Waterfront Street | New Haven | CT | — | ◐ LIKELY ACTIVE |
| 3A3m Aston | Aston | PA | — | ◐ LIKELY ACTIVE |
| 3T3m Technical Ceramics Quapaw, LLC | Quapaw | OK | — | ◐ LIKELY ACTIVE |
| ARAdvanced Research Chemicals INC. | Catoosa | OK | — | ◐ LIKELY ACTIVE |
| ADAes Drilling Fluids Clinton | Clinton | OK | — | ◐ LIKELY ACTIVE |
| APAir Products Manufacturing LLC | Paramount | CA | — | ◐ LIKELY ACTIVE |
| AHAjinomoto Health & Nutrition North America, INC. | Eddyville | IA | — | ◐ LIKELY ACTIVE |
| APAli Pharmaceutical Mfg LLC | Omaha | NE | — | ◐ LIKELY ACTIVE |
| ALAltuni LLC | South Hackensack | NJ | — | ◐ LIKELY ACTIVE |
| ACAmerchol CORP | Greensburg | LA | — | ◐ LIKELY ACTIVE |
| AAAmerican Acryl | Pasadena | TX | — | ◐ LIKELY ACTIVE |
| ACAmerican Chrome & Chemicals | Corpus Christi | TX | — | ◐ LIKELY ACTIVE |
| AIAmerican Inks & Coatings Corporation | Florence | KY | — | ◐ LIKELY ACTIVE |
| AMAqua Metals | Sparks | NV | — | ◐ LIKELY ACTIVE |
| AVArrmaz Vanceboro Facility | Vanceboro | NC | — | ◐ LIKELY ACTIVE |