| IKIes - Kapolei | Kapolei | HI | — | ◐ LIKELY ACTIVE |
| ICImc-agrico Company, Port Sutton Terminal | Tampa | FL | — | ◐ LIKELY ACTIVE |
| ICImerys Carbonates LLC | Sylacauga | AL | — | ◐ LIKELY ACTIVE |
| IAINCA Acquisitions DBA Dometic Marine Products | Sparta | TN | 100–499 | ◐ LIKELY ACTIVE |
| ITIndependence Technology Center | Independence | OH | — | ◐ LIKELY ACTIVE |
| IVIndorama Ventures Bayport Clear Lake Site | Pasadena | TX | 20–99 | ◐ LIKELY ACTIVE |
Indorama Ventures Oxides LLC | Port Neches | TX | 500+ | ◐ LIKELY ACTIVE |
| IRIndustrial Recyclers, LLC | Sidney | OH | 20–99 | ◐ LIKELY ACTIVE |
| IRIndustrial Resources Network,llc | Wilmington | DE | — | ◐ LIKELY ACTIVE |
| IWInfiltrator Water Technologies LLC | Winchester | KY | 100–499 | ◐ LIKELY ACTIVE |
| ICInfinity Contacts, INC. | Rancho Cucamonga | CA | — | ◐ LIKELY ACTIVE |
| ICInnovative Chemical Technologies, INC. | Augusta | GA | — | ◐ LIKELY ACTIVE |
| ICIntematix Corporation | Fremont | CA | 1–19 | ◐ LIKELY ACTIVE |
| ICIntergulf CORP Lonestar Ecology LLC (lonstr) | Pasadena | TX | — | ◐ LIKELY ACTIVE |
| ISIntergulf - Strang Rd Facility | La Porte | TX | — | ◐ LIKELY ACTIVE |
| IOInventek of Mt Laurel | Mount Laurel | NJ | — | ◐ LIKELY ACTIVE |
| ITIperionx Technology LLC | South Boston | VA | — | ◐ LIKELY ACTIVE |
| MP(IPL) Macro Plastics | Shelbyville | KY | 100–499 | ◐ LIKELY ACTIVE |
| ICIsp Chemicals LLC | Calvert City | KY | — | ◐ LIKELY ACTIVE |
| JFJacksonville Facility | Jacksonville | FL | 20–99 | ◐ LIKELY ACTIVE |
Johns Manville Technical Center | Littleton | CO | — | ◐ LIKELY ACTIVE |
| JCJwa Co., LTD. | Kokomo | IN | — | ◐ LIKELY ACTIVE |
| KPK2 Pure Solutions | Pittsburg | CA | 20–99 | ◐ LIKELY ACTIVE |
| KPK2 Pure Solutions - Pittsburg Plant | Pittsburg | CA | — | ◐ LIKELY ACTIVE |
| KRKairos Research | Wilmington | NC | — | ◐ LIKELY ACTIVE |
| KMKalco Metals | Wheatland | PA | — | ◐ LIKELY ACTIVE |
| KWKemira Water Solutions, INC. | Fontana | CA | — | ◐ LIKELY ACTIVE |
| KOKern Oil & Refinery CO. | Bakersfield | CA | — | ◐ LIKELY ACTIVE |
| KIKicksplosion, INC. | Newnan | GA | 1–19 | ◐ LIKELY ACTIVE |
| KMKinder Morgan Wilmington Terminal | Wilmington | NC | — | ◐ LIKELY ACTIVE |
| KCKing Cnty Solid Wst Cedar Hills Landfill | Maple Valley | WA | — | ◐ LIKELY ACTIVE |
| KIKing Industries | Waterbury | CT | — | ◐ LIKELY ACTIVE |
| KFKnf Flexpak Corporation | Tamaqua | PA | 20–99 | ◐ LIKELY ACTIVE |
| KIKordsa, INC. | Chattanooga | TN | — | ◐ LIKELY ACTIVE |
| KAKuraray America, INC | Pasadena | TX | — | ◐ LIKELY ACTIVE |
| LGLa Granja 555 LLC - Agricola Plant | Bartow | FL | — | ◐ LIKELY ACTIVE |
| LELake Erie Biofuels LLC d/b/a Hero BX | Erie | PA | 20–99 | ◐ LIKELY ACTIVE |
| LCLanxess CORP | Burgettstown | PA | — | ◐ LIKELY ACTIVE |
| LCLanxess Corporation | Kalama | WA | 100–499 | ◐ LIKELY ACTIVE |
| LOLanxess Oxone Memphis Plant | Memphis | TN | — | ◐ LIKELY ACTIVE |
| LSLanxess Solutions Us, INC. | Perth Amboy | NJ | — | ◐ LIKELY ACTIVE |
| LFLanzajet Freedom Pines Fuels LLC | Soperton | GA | — | ◐ LIKELY ACTIVE |
| LPLaser Products, INC. | Juncos | PR | — | ▲ REPORTED CLOSED |
| LRLaurel Refinery | Laurel | MT | 100–499 | ◐ LIKELY ACTIVE |
| LCLg Chem Tennessee Advanced Materials, INC. | Clarksville | TN | 20–99 | ◐ LIKELY ACTIVE |
| LPLiner Products | Paoli | IN | 20–99 | ◐ LIKELY ACTIVE |
| LOLion Oil Company | El Dorado | AR | 100–499 | ◐ LIKELY ACTIVE |
| LGLouisiana Green Fuels LLC - Louisiana Green Fuels | Columbia | LA | — | ◐ LIKELY ACTIVE |
| LCLubrizol CORP | Wickliffe | OH | — | ◐ LIKELY ACTIVE |
| LOLuebbering Oil CO | Hartsburg | MO | — | ◐ LIKELY ACTIVE |
| LCLunday-Thagard Company, d/b/a World Oil Refining, a California Corporation | South Gate | CA | 20–99 | ◐ LIKELY ACTIVE |
Luxfer Magtech Saxonburg Plt | Saxonburg | PA | — | ◐ LIKELY ACTIVE |
| LMLuxfer MEL Technologies - Saxonburg | Saxonburg | PA | 20–99 | ◐ LIKELY ACTIVE |
| MIMagretech Incorporated | Bellevue | OH | 20–99 | ◐ LIKELY ACTIVE |
| MIMagsphere, INC. | Pasadena | CA | — | ▲ REPORTED CLOSED |
| MPMarathon Petroleum Company LP | Findlay | OH | — | ◐ LIKELY ACTIVE |
| MLMarkwest Langley Processing Plant | Langley | KY | — | ◐ LIKELY ACTIVE |
| MRMarshallton Research Laboratories, INC. | Tobaccoville | NC | — | ◐ LIKELY ACTIVE |
| MRMartinez Refining Company LLC (previously Shell Oil Products Us, Martinez Ref.) | Martinez | CA | — | ◐ LIKELY ACTIVE |
| MHMarysville Hydrocarbons | Marysville | MI | — | ◐ LIKELY ACTIVE |
| MPMastercraft Pattern C/o Jonah Bishop | Pittsburg | KS | — | ◐ LIKELY ACTIVE |
| MAMaterion Advanced Chemicals INC. | Milwaukee | WI | — | ◐ LIKELY ACTIVE |
| MCMaterion CORP | Albuquerque | NM | — | ◐ LIKELY ACTIVE |
| MIMecs INC | Martinez | CA | 20–99 | ◐ LIKELY ACTIVE |
| MIMedford International Holdings | Medford | OR | 1–19 | ◐ LIKELY ACTIVE |
| MGMetalico-college Grove, INC. | College Grove | TN | — | ◐ LIKELY ACTIVE |
Metal Products | Suwanee | GA | — | ◐ LIKELY ACTIVE |
| MSMexichem Specialty Resins, INC. | Henry | IL | 100–499 | ◐ LIKELY ACTIVE |
| MSMichigan State University - Bioeconomy Institute | Holland | MI | — | ◐ LIKELY ACTIVE |
| MCMidland Corteva Agrisciences | Midland | MI | 500+ | ◐ LIKELY ACTIVE |
| MRMid-States Recycling & Refining | Des Plaines | IL | 20–99 | ◐ LIKELY ACTIVE |
| MWMiller Waste Mills INC Dba Rtp Company | Henderson | KY | — | ◐ LIKELY ACTIVE |
| MPMilne Point Unit | Prudhoe Bay | AK | — | ◐ LIKELY ACTIVE |
| MLMinasolve LLC | Memphis | TN | — | ◐ LIKELY ACTIVE |
| MCMitsubishi Chemical America, Performance Polymers | Greer | SC | 20–99 | ◐ LIKELY ACTIVE |
| MCMitsubishi Chemical Group | Stockton | CA | 20–99 | ◐ LIKELY ACTIVE |
| MAMonroe Alfrebro, LLC | Monroe | OH | 20–99 | ◐ LIKELY ACTIVE |
| MRMontana Renewables LLC | Great Falls | MT | — | ◐ LIKELY ACTIVE |
| MFMosaic Fertilizer LLC Bonnie Facility | Bartow | FL | — | ◐ LIKELY ACTIVE |
| MFMosaic Fertilizer, LLC - Hardee North Pasture Mine | Wauchula | FL | — | ◐ LIKELY ACTIVE |
| MFMosaic Fertilizer Llc, Plant City Facility | Plant City | FL | — | ◐ LIKELY ACTIVE |
| MPMosaic Phosphates Company - Nichols Plant | Mulberry | FL | — | ◐ LIKELY ACTIVE |
| MTMosaic Tampa Marine Terminal | Tampa | FL | — | ◐ LIKELY ACTIVE |
| MEMotiva Enterprises LLC | Port Arthur | TX | 500+ | ◐ LIKELY ACTIVE |
| MIM&u International LLC | Branchburg | NJ | — | ◐ LIKELY ACTIVE |
| MPMulberry Phosphogypsum Stack System Closure | Bartow | FL | — | ◐ LIKELY ACTIVE |
| MAMundell & Associates, INC. | Indianapolis | IN | — | ◐ LIKELY ACTIVE |
| MIMuscatine, IA | Muscatine | IA | 100–499 | ◐ LIKELY ACTIVE |
| MLMytee LLC | Poway | CA | 20–99 | ◐ LIKELY ACTIVE |
| NLNaprotec LLC | Chattanooga | TN | — | ◐ LIKELY ACTIVE |
| NMNational Molding LLC | Miami Lakes | FL | — | ◐ LIKELY ACTIVE |
| NSNational Starch and Chemical Company | Enoree | SC | — | ◐ LIKELY ACTIVE |
| NONecessary Oil & Trucking CO | Bristol | TN | — | ◐ LIKELY ACTIVE |
| NNewchem | New Cumberland | WV | — | ◐ LIKELY ACTIVE |
| NENew England Biolabs, INC. | Ipswich | MA | — | ◐ LIKELY ACTIVE |
| NPNewport Plastics - Ncic Property | Lyndon | VT | — | ◐ LIKELY ACTIVE |
| NRNew Rise Renewables Reno, LLC | Mccarran | NV | 20–99 | ◐ LIKELY ACTIVE |
| NHNexolve Holding Company - Quality Circle Facility | Huntsville | AL | — | ◐ LIKELY ACTIVE |
| NNNexpera - New Orleans Central | Chalmette | LA | 1–19 | ◐ LIKELY ACTIVE |
| NANorac Additives, LLC | Helena | AR | 20–99 | ◐ LIKELY ACTIVE |