| 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. Army Redstone Arsenal | Redstone Arsenal | AL | — | ◐ LIKELY ACTIVE |
| UEUS Enrichment CORP Paducah Gaseous Diffusion Plant | Paducah | KY | — | ◐ 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 |
| WFWholesome Foods INC - Edinburg | Edinburg | VA | — | ◐ 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 |
| 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 |
| AAdvansix | Philadelphia | PA | — | ◐ 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 |
| AEAllegheny Energy Pleasants Power Station | Belmont | WV | — | ◐ LIKELY ACTIVE |