| Max Environmental -- Yukon Facility | Yukon | 61.3k |
| Cleveland-Cliffs Steel Corp /Butler Works | Butler | 46.6k |
| Saint Nicholas Cogeneration Project | Shenandoah | 43.0k |
| Panther Creek Power Operating Llc | Nesquehoning | 11.0k |
| Cleveland-Cliffs Plate Llc Coatesville Facility | Coatesville | 7.3k |
| Libertas Copper Llc | Leetsdale | 6.0k |
| Electric Materials Co | North East | 3.0k |
| Culpeper Of Leola Llc | Leola | 881 |
| Piad Precision Casting Corp | Greensburg | 500 |
| Standard Steel Llc | Burnham | 346 |
| Hanwha Philly Shipyard Inc | Philadelphia | 318 |
| Pennsylvania Transformer Technology Llc | Canonsburg | 290 |
| Ward Manufacturing Llc | Blossburg | 242 |
| Carpenter Technology Corp | Reading | 235 |
| Northampton Generating Plant | Northampton | 231 |
| General Dynamics Ots (Wilkes-Barre) Llc - Hanover Facility | Wilkes Barre | 208 |
| Uss Mon Valley Works - Edgar Thomson Plant | Braddock | 107 |
| Tms International Llc/New Castle Plt | New Castle | 79 |
| Electralloy | Oil City | 76 |
| Global Tungsten & Powders Llc | Towanda | 75 |
| Mcconway & Torley Llc Plt 1801 | Pittsburgh | 64 |
| North American Hoganas | Hollsopple | 64 |
| Materion Brush Inc | Shoemakersville | 59 |
| Jessop Steel Llc | Washington | 42 |
| Seward Power Plant | New Florence | 34 |
| Tms International Llc | Braddock | 34 |
| Pennex Aluminum Co Llc | Greenville | 28 |
| Ppg Industriesinc-Springdale Complex | Springdale | 28 |
| Cleveland-Cliffs Steelton Llc | Steelton | 25 |
| Ati Flat Rolled Products Holdings Llc | Brackenridge | 20 |
| Colver Green Energy | Colver | 18 |
| Langeloth Metallurgical Co | Langeloth | 15 |
| Pennex Aluminum Co | Wellsville | 12 |
| Calgon Carbon Corp Neville Island Plant | Pittsburgh | 11 |
| Gilberton Power Co | Frackville | 10 |
| Global Advanced Metals Usa | Boyertown | 7 |
| Victaulic Co - Forks Facility | Easton | 7 |
| Ati Flat Rolled Products Holdings Llc | Vandergrift | 7 |
| Ufp Stockertown Llc | Stockertown | 5 |
| Rausch Creek Generation Llc | Tremont | 5 |
| Wenger Feeds - Esbenshade Mill | Mount Joy | 4 |
| Wenger Feeds Llc-Muncy (F/K/A Wenger Feed Mill Inc) | Muncy | 2 |
| Wenger Feeds Llc-Spring Glen (F/K/A Wenger Feed Mill Inc) | Spring Glen | 2 |
| Iwm - Wire Facility | York | 1 |
| Custom Processing Services Llc | East Greenville | 1 |
| Borchers Americas Inc. | Franklin | 1 |
| Elk Corp Of Texas Llc Myerstown Facility | Myerstown | 1 |
| Wenger Feeds Llc-Shippensburg (F/K/A Wenger's Feed Mill In | Shippensburg | 1 |
| Wenger Feeds Llc-Mount Joy (F/K/A Wenger's Feed Mill Inc) | Mount Joy | 1 |
| Wenger Feeds Llc-Rheems (F/K/A Wenger Feed Mill Inc) | Elizabethtown | 1 |
| Ampal | Palmerton | 1 |
| Alpha Assembly Solutions | Altoona | 0 |
| Emporium Specialties Co Inc | Austin | 0 |
| Johnson Matthey Inc | Smithfield | 0 |
| Novae Llc - Cam Superline | Waynesboro | 0 |
| Nestle Purina Petcare Co | Mechanicsburg | 0 |
| Mellott Wood Preserving Co Inc | Needmore | 0 |
| World Resources Co | Pottsville | 0 |
| Flexible Circuits Mfg | Warrington | 0 |
| Hoover Treated Wood Products Inc. | Oxford | 0 |
| Envirite Of Pennsylvania Inc | York | 0 |
| Malmark Bells Inc | Plumsteadville | 0 |
| Prowood Llc Fairless Hills | Fairless Hills | 0 |
| Ellwood City Forge - X Plant | Ellwood City | 0 |
| Specialty Chemical Systems Inc | Pottstown | 0 |
| Apollo Metals Ltd | Bethlehem | 0 |
| Mpn Inc Dba Active Radiator | Philadelphia | 0 |
| Keystone Fence Supplies Llc | Schaefferstown | 0 |
| Cargill Feed & Nutrition Winfield | Winfield | 0 |
| Bestway Of Pennsylvania Inc. | Cresco | 0 |
| Sherwin-Williams Co | Pittsburgh | 0 |
| Cargill Feed & Nutrition Martinsburg | Martinsburg | 0 |
| Purina Animal Nutrition Llc - Harrisburg | Camp Hill | 0 |
| Phoenix Sintered Metals Llc | Galeton | 0 |