| Prairie State Generating Co | Marissa | 1.7M |
| Laraway Recycling & Disposal Facility | Joliet | 34.7k |
| Newton Energy Center | Newton | 18.8k |
| Keystone Steel & Wire Co D/B/A Liberty Steel & Wire Peoria | Bartonville | 12.0k |
| Befesa Zinc Us Inc. | Chicago | 8.7k |
| Imperial Zinc Corp | Chicago | 8.6k |
| Wood River Refinery | Roxana | 3.1k |
| Ridley Usa Inc (Dba Ridley Feed Ingredients) | Mendota | 3.0k |
| Exxonmobil Oil Corp Joliet Refinery | Channahon | 3.0k |
| Sterling Steel Co Llc | Sterling | 3.0k |
| Azz Galvanizing Services-Dixon | Dixon | 2.9k |
| Azz Galvanizing Services-Joliet | Joliet | 2.7k |
| Cleveland-Cliffs Riverdale Llc | Riverdale | 2.6k |
| Baldwin Energy Complex | Baldwin | 2.2k |
| Belmont Plating Works | Franklin Park | 2.1k |
| Alton Steel Inc | Alton | 1.9k |
| Azz Galvanizing Services-Peoria | Peoria | 1.7k |
| Riverdale Plating & Heat Treating Llc | Riverdale | 1.7k |
| Nanophase Technologies Corp | Romeoville | 1.7k |
| Midland Industries Inc | Chicago | 1.4k |
| Nucor Steel Kankakee Inc | Bourbonnais | 1.1k |
| Citgo Petroleum Corp Lemont Refinery | Lemont | 1.1k |
| Wieland Rolled Products N.a. - East Alton Main Plan | East Alton | 1.0k |
| Nanophase Technologies Corp | Burr Ridge | 859 |
| Fuchs Lubricants Co-Corporate Office | Harvey | 827 |
| Marathon Petroleum Co Lp Illinois Refining Div | Robinson | 790 |
| Amsted Rail Co Inc | Granite City | 772 |
| Olin Winchester Llc Main Plant | East Alton | 718 |
| Valmont Coatings Inc Empire Galvanizing | Franklin Park | 713 |
| Morgan Ohare Inc. | Addison | 690 |
| Vibracoustic Usa Inc. Carmi Mixing Div | Carmi | 689 |
| Midwestern Rust Proof Inc | Chicago | 680 |
| Evonik Corp | Mapleton | 634 |
| East Dubuque Nitrogen Fertilizers Llc | East Dubuque | 630 |
| Afton Chemical Corp | Sauget | 600 |
| Chem-Plate Industries Inc | Elk Grove Village | 552 |
| Wieland Rolled Products N.a. - East Alton Casting P | East Alton | 500 |
| Grove Plating Co Inc. | Fox River Grove | 463 |
| Chem-Plate Industries | Elk Grove Village | 442 |
| Illinois Mpp Corp | Du Quoin | 439 |
| Sipi Metals Corp. | Chicago | 360 |
| Carus Llc Lasalle Site | La Salle | 300 |
| Sem Minerals Lp | Quincy | 250 |
| Huber Engineered Materials | Quincy | 250 |
| Nanophase Technologies Corp | Bolingbrook | 250 |
| Azz Galvanizing - Rockford Llc | Rockford | 227 |
| Meminger Metal Finishing Inc | Aledo | 223 |
| Becker Specialty Corp | Elk Grove Village | 199 |
| Prince Agri Products Inc | Quincy | 178 |
| Continental Tire The Americas Llc | Mount Vernon | 149 |
| J&m Plating | Rockford | 136 |
| S&c Electric Co | Chicago | 128 |
| Modern Plating Corp | Freeport | 121 |
| Real Alloy Recycling Llc | Chicago Heights | 111 |
| Titan Tire Corp Of Freeport | Freeport | 110 |
| Prince Agri Products Inc. | Quincy | 105 |
| Sherwin-Williams Co | Chicago | 104 |
| H Kramer & Co | Chicago | 92 |
| Anchor Brake Shoe Co | West Chicago | 92 |
| Wheatland Tube Western Tube | Rochelle | 62 |
| Adm Animal Nutrition | Effingham | 56 |
| Swan Surfaces Llc | Centralia | 56 |
| Ineos Styrolution America Llc | Channahon | 53 |
| Swd Inc. | Addison | 47 |
| South Holland Metal Finishing | Monee | 40 |
| Ahf Products | Kankakee | 34 |
| Sherwin-Williams Co | Moline | 33 |
| Cmp Anodizing | Elk Grove Village | 31 |
| Sherwin-Williams Co | Wheeling | 29 |
| Gates Corp | Galesburg | 24 |
| Sponge Cushion Inc | Morris | 19 |
| Envirite Of Illinois Inc | Harvey | 17 |
| Scot Forge Co | Spring Grove | 15 |
| Trouw Nutrition Usa Llc | Highland | 9 |
| Electri-Flex Co | Roselle | 7 |
| Rocknel Fastener Inc. | Rockford | 7 |
| Bridgestone Americas Off Road | Normal | 6 |
| Sherwin-Williams Co | Matteson | 6 |
| Blachford Corp | Frankfort | 5 |
| Exxonmobil Cicero Lube Plant | Cicero | 5 |
| Southern Illinois Power Cooperative | Marion | 5 |
| Lake Cable Llc | Bensenville | 5 |
| Dixline Corp | Galva | 5 |
| Mckay's Plating Co | Hampton | 4 |
| Guardian West | Urbana | 3 |
| Veolia Water Technologies & Solutions Inc. - Addison | Addison | 3 |
| Accurate Dispersions | South Holland | 3 |
| Chroma Color Corp | Mc Henry | 2 |
| Americas Styrenics Llc - Joliet Site | Channahon | 2 |
| Saporito Finishing Co | Cicero | 2 |
| Hentzen Coatings, Inc Batavia Facility | Batavia | 2 |
| Three J's Industries Inc. | Elk Grove Village | 1 |
| Chicago Extruded Metals Co | Cicero | 1 |
| Veolia N.a. Inc. | Sauget | 0 |
| W. H. Maze Co -Nail Div | Peru | 0 |
| Air Products & Chemicals Inc. - Channahon Il H2 Plant | Channahon | 0 |
| Kent Nutrition Group Inc | Beardstown | 0 |
| Duquoin Lubricants Blending & Packaging Div | Du Quoin | 0 |
| Crane Composites Inc. | Channahon | 0 |
| Honeywell International Inc-Plant 4 | Freeport | 0 |