| GCGrow Choice Ag INC Dba Brickers Choice Fertilizer | Marion | — | ◐ LIKELY ACTIVE |
| HCHydrol Chemical Company | Yeadon | — | ◐ LIKELY ACTIVE |
| JRJsp Resins, LLC | Wayne | 500+ | ◐ LIKELY ACTIVE |
| KCKl Chempak, INC. | Lester | — | ◐ LIKELY ACTIVE |
| LCLanxess CORP | Burgettstown | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Comm Space Sys Lmcss | Newtown | — | ◐ LIKELY ACTIVE |
| LCLord CORP. Industrial Products | Cambridge Springs | — | ◐ LIKELY ACTIVE |
| MHMasonic Homes/elizabethtown | Elizabethtown | — | ◐ LIKELY ACTIVE |
| MCMayflower Clnr/bensalem | Bensalem | — | ◐ LIKELY ACTIVE |
| MCMcneil Consumer Healthcare | Lancaster | — | ◐ LIKELY ACTIVE |
| NINetzsch INC | Exton | — | ◐ LIKELY ACTIVE |
| NPNew Pig Corporation | Tipton | 500+ | ◐ LIKELY ACTIVE |
| PUPolyglass USA | Hazleton | — | ◐ LIKELY ACTIVE |
| PPPrecision Polymer Prod/pottstown | Pottstown | — | ◐ LIKELY ACTIVE |
| PLPurolite LLC | King of Prussia | 100–499 | ◐ LIKELY ACTIVE |
| REReliant Energy Warren Station | Warren | — | ◐ LIKELY ACTIVE |
| RHRohm & Haas Co/bristol | Bristol | — | ◐ LIKELY ACTIVE |
| RHRohm & Haas Company | Philadelphia | — | ◐ LIKELY ACTIVE |
| SPSanofi Pasteur | Swiftwater | 500+ | ◐ LIKELY ACTIVE |
| SCSanyo Chem & Resin Inc/jefferson Site | West Elizabeth | — | ◐ LIKELY ACTIVE |
| SWSherwin Williams Mfg Co/lebanon Plt | Lebanon | — | ◐ LIKELY ACTIVE |
| SCSpecialty Chemical Systems, INC | Pottstown | — | ◐ LIKELY ACTIVE |
| TETherm-o-rock East INC | Donora | — | ◐ LIKELY ACTIVE |
| URUnion Roto-graving/quakertown | Quakertown | — | ◐ LIKELY ACTIVE |
| UCUnited Chemical Technologies | Bristol | — | ◐ LIKELY ACTIVE |
| UCUnited Color Manufacturing INC | Philadelphia | — | ◐ LIKELY ACTIVE |
| WHWampum Hardware Company | New Galilee | 100–499 | ◐ LIKELY ACTIVE |
| WPWashington Penn Plas/v-bat | Washington | — | ◐ LIKELY ACTIVE |
Western International Gas & Cylinders, INC. | Berwick | — | ◐ LIKELY ACTIVE |
| ZFZambelli Fireworks Mfg CO | Edinburg | — | ◐ LIKELY ACTIVE |
| 3A3m Aston | Aston | — | ◇ UNVERIFIED |
| AIAccupac, INC. | Lansdale | — | ◇ UNVERIFIED |
| ASAdvanced Skin Technologies, INC. | Bernville | — | ◇ UNVERIFIED |
| ATAdvanced Therapies, LLC | Philadelphia | — | ◇ UNVERIFIED |
| AIAffival INC | Oakmont | — | ◇ UNVERIFIED |
| ATAgraco Technologies International | Dillsburg | — | ◇ UNVERIFIED |
| APAgsalt Processing LLC | Gettysburg | — | ◇ UNVERIFIED |
| ALAir Liquide America CORP Coatesville Asu | Coatesville | — | ◇ UNVERIFIED |
| APAir Prod & Chem | Morrisville | — | ◇ UNVERIFIED |
| APAir Products and Chemicals, INC. | Creighton | — | ◇ UNVERIFIED |
| ACAllegheny Chemical CORP | Ridgway | — | ◇ UNVERIFIED |
| AHAmer Heterocyclic Research | Bradford | — | ◇ UNVERIFIED |
| AIAmerican Iron Oxide CO - Allenport Facility | Allenport | — | ◇ UNVERIFIED |
| AVAmer Video Glass Co/mt Pleasant Plt | Mount Pleasant | — | ◇ UNVERIFIED |
| APApozeal Pharm INC | Levittown | — | ◇ UNVERIFIED |
| AIApter Industries | Mckeesport | — | ◇ UNVERIFIED |
| ACAqua Chemical Supply, INC | Millersburg | — | ◇ UNVERIFIED |
| ALAurorium LLC | Delaware Water Gap | — | ◇ UNVERIFIED |
| BPBayer Polymers LLC | Newtown Square | — | ◇ UNVERIFIED |
| BUBayer USA INC | Pittsburgh | — | ◇ UNVERIFIED |