| JRJsp Resins, LLC | Wayne | PA | Chemical Manufacturing325211 | 500+ | ◐ LIKELY ACTIVE |
| KCKl Chempak, INC. | Lester | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| LCLanxess CORP | Burgettstown | PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Comm Space Sys Lmcss | Newtown | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| LCLord CORP. Industrial Products | Cambridge Springs | PA | Chemical Manufacturing325314 | — | ◐ LIKELY ACTIVE |
| MHMasonic Homes/elizabethtown | Elizabethtown | PA | Chemical Manufacturing325200 | — | ◐ LIKELY ACTIVE |
| MCMayflower Clnr/bensalem | Bensalem | PA | Chemical Manufacturing325188 | — | ◐ LIKELY ACTIVE |
| MCMcneil Consumer Healthcare | Lancaster | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| NINetzsch INC | Exton | PA | Chemical Manufacturing325320 | — | ◐ LIKELY ACTIVE |
| NPNew Pig Corporation | Tipton | PA | Chemical Manufacturing325211 | 500+ | ◐ LIKELY ACTIVE |
| PUPolyglass USA | Hazleton | PA | Petroleum and Coal Products Manufacturing324122 | — | ◐ LIKELY ACTIVE |
| PPPrecision Polymer Prod/pottstown | Pottstown | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| PLPurolite LLC | King of Prussia | PA | Chemical Manufacturing325211 | 100-499 | ◐ LIKELY ACTIVE |
| REReliant Energy Warren Station | Warren | PA | Chemical Manufacturing325414 | — | ◐ LIKELY ACTIVE |
| RHRohm & Haas Co/bristol | Bristol | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| RHRohm & Haas Company | Philadelphia | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| SPSanofi Pasteur | Swiftwater | PA | Chemical Manufacturing325414 | 500+ | ◐ LIKELY ACTIVE |
| SCSanyo Chem & Resin Inc/jefferson Site | West Elizabeth | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| SWSherwin Williams Mfg Co/lebanon Plt | Lebanon | PA | Chemical Manufacturing325311 | — | ◐ LIKELY ACTIVE |
| SCSpecialty Chemical Systems, INC | Pottstown | PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| TETherm-o-rock East INC | Donora | PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| URUnion Roto-graving/quakertown | Quakertown | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| UCUnited Chemical Technologies | Bristol | PA | Chemical Manufacturing325188 | — | ◐ LIKELY ACTIVE |
| UCUnited Color Manufacturing INC | Philadelphia | PA | Chemical Manufacturing325132 | — | ◐ LIKELY ACTIVE |
| WHWampum Hardware Company | New Galilee | PA | Chemical Manufacturing325920 | 100-499 | ◐ LIKELY ACTIVE |
| WPWashington Penn Plas/v-bat | Washington | PA | Chemical Manufacturing325991 | — | ◐ LIKELY ACTIVE |
Western International Gas & Cylinders, INC. | Berwick | PA | Chemical Manufacturing325120 | — | ◐ LIKELY ACTIVE |
| ZFZambelli Fireworks Mfg CO | Edinburg | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
| 3A3m Aston | Aston | PA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| AIAccupac, INC. | Lansdale | PA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| ASAdvanced Skin Technologies, INC. | Bernville | PA | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| ATAdvanced Therapies, LLC | Philadelphia | PA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| AIAffival INC | Oakmont | PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| ATAgraco Technologies International | Dillsburg | PA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| APAgsalt Processing LLC | Gettysburg | PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| ALAir Liquide America CORP Coatesville Asu | Coatesville | PA | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| APAir Prod & Chem | Morrisville | PA | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| APAir Products and Chemicals, INC. | Creighton | PA | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| ACAllegheny Chemical CORP | Ridgway | PA | Chemical Manufacturing325100 | — | ◇ UNVERIFIED |
| AHAmer Heterocyclic Research | Bradford | PA | Chemical Manufacturing325992 | — | ◇ UNVERIFIED |
| AIAmerican Iron Oxide CO - Allenport Facility | Allenport | PA | Chemical Manufacturing325130 | — | ◇ UNVERIFIED |
| AVAmer Video Glass Co/mt Pleasant Plt | Mount Pleasant | PA | Chemical Manufacturing325193 | — | ◇ UNVERIFIED |
| APApozeal Pharm INC | Levittown | PA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| AIApter Industries | Mckeesport | PA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| ACAqua Chemical Supply, INC | Millersburg | PA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |
| ALAurorium LLC | Delaware Water Gap | PA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| BPBayer Polymers LLC | Newtown Square | PA | Chemical Manufacturing325000 | — | ◇ UNVERIFIED |
| BUBayer USA INC | Pittsburgh | PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| BDBellmeade Dry Clnr | Altoona | PA | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| BOBerkebile Oil CO INC | Somerset | PA | Chemical Manufacturing325998 | 20-99 | ◇ UNVERIFIED |