| NFNatl Fuel Gas Supply/east Fork Comp Sta | Austin | — | ◐ LIKELY ACTIVE |
| NFNatl Fuel Gas Supply/ellisburg Sta | Ellisburg | — | ◐ LIKELY ACTIVE |
| OBOwens Brockway Glass Container Plt 18 | Brockway | — | ◐ LIKELY ACTIVE |
| PPPa Perlite CORP | Bethlehem | — | ◐ LIKELY ACTIVE |
| QCQuikrete CO Inc/harrisburg Plt | Paxinos | — | ◐ LIKELY ACTIVE |
| RCRc Concrete | Burgettstown | — | ◐ LIKELY ACTIVE |
| RPResco Products Inc/new Castle Plant | New Castle | — | ◐ LIKELY ACTIVE |
| RCRiverside Const Materials/bristol Twp | Bristol | — | ◐ LIKELY ACTIVE |
| RRoyersford | Royersford | 20–99 | ◐ LIKELY ACTIVE |
| RHRwe Holding CO - West Pittsburg Plant | New Castle | — | ◐ LIKELY ACTIVE |
| SCSaint-Gobain Ceramics | Olyphant | 20–99 | ◐ LIKELY ACTIVE |
| SCScranton Craftsmen Incorporated | Throop | 20–99 | ◐ LIKELY ACTIVE |
| SCSilvi Concrete Morrisville Plt | Fairless Hills | — | ◐ LIKELY ACTIVE |
| SMSkyline Metals Llc/slag Processing Plt | Baden | — | ◐ LIKELY ACTIVE |
| SCStone & CO INC Canonsburg Plt | Canonsburg | — | ◐ LIKELY ACTIVE |
| TBThe Bauer Company INC. | Worthington | 20–99 | ◐ LIKELY ACTIVE |
| TFThe Fredericks Company, INC. | Huntingdon Valley | — | ◐ LIKELY ACTIVE |
| TATYK America | Clairton | 20–99 | ◐ LIKELY ACTIVE |
| UCUniontown Concrete Plt | Hopwood | — | ◐ LIKELY ACTIVE |
| UPUnited Plate Glass Company (Butler) | Butler | 100–499 | ◐ LIKELY ACTIVE |
| UGUS Gypsum Washingtonville | Danville | 100–499 | ◐ LIKELY ACTIVE |
| URUS Resistor Inc/st Marys | Saint Marys | — | ◐ LIKELY ACTIVE |
| VPVesuvius Penn Wampum/lawrence | Wampum | — | ◐ LIKELY ACTIVE |
| VMVitro Meadville Flat Glass Meadville Plt/crawford | Meadville | — | ◐ LIKELY ACTIVE |
| WSWindber Stone Llc/ogletown Quarry | Windber | — | ◐ LIKELY ACTIVE |
| WKWorld Kitchen LLC - Charleroi Plant | Charleroi | — | ◐ LIKELY ACTIVE |
| YBYork Building Products CO Inc/new Holland | New Holland | — | ◐ LIKELY ACTIVE |
| ACAnchor Concrete Fredonia Plt | Fredonia | — | ◐ LIKELY ACTIVE |
| AEArdex Engineered Cements | Aliquippa | — | ◐ LIKELY ACTIVE |
| BIBbgy INC Dba Boger Concrete Company | Annville | — | ◐ LIKELY ACTIVE |
| BIBlend-pro INC | Allentown | — | ◐ LIKELY ACTIVE |
| BMBnz Materials Inc/zelienople | Zelienople | — | ◐ LIKELY ACTIVE |
| CICampania Intl Inc/pennsburg | Pennsburg | — | ◐ LIKELY ACTIVE |
| CCCentre Concrete CO State College Plt | State College | — | ◐ LIKELY ACTIVE |
| CCCentre Concrete State College Plt | State College | — | ◐ LIKELY ACTIVE |
| CLCon Lime Inc/bellefonte | Bellefonte | — | ◐ LIKELY ACTIVE |
| DCDaniels Concrete Batch Plt | Greensburg | — | ◐ LIKELY ACTIVE |
| DSDoolittle Stone Saw Shop | Montrose | — | ◐ LIKELY ACTIVE |
| GHGeneration Holdings Lp/colver Processing Fac | Colver | — | ◐ LIKELY ACTIVE |
| HPHanover Prest Paving Brick Plt | Hanover | — | ◐ LIKELY ACTIVE |
| JMJdm Materials Norristown Batch Plt | Norristown | — | ◐ LIKELY ACTIVE |
| KQKutztown Quarry | Kutztown | — | ◐ LIKELY ACTIVE |
| LCLafarge CORP Duquesne_plant | Pittsburgh | — | ◐ LIKELY ACTIVE |
| MSMcclain Stone CO. INC. Brooklyn Saw Shop | Kingsley | — | ◐ LIKELY ACTIVE |
| MPMonarch Products Company INC - Strinestown | York | — | ◐ LIKELY ACTIVE |
| NFNatl Fuel Gas Supply/lamont Comp Sta | Kane | — | ◐ LIKELY ACTIVE |
| NCNitterhouse Concrete Prod | Chambersburg | — | ◐ LIKELY ACTIVE |
| OAOldcastle Apg Easton | Easton | — | ◐ LIKELY ACTIVE |
| OBOwens Brockway Glass Container Inc/plt 7 | Brockport | — | ◐ LIKELY ACTIVE |
| PSPennsy Supply Inc/landisville Quarry | Landisville | — | ◐ LIKELY ACTIVE |