| VIVigon International LLC | East Stroudsburg | PA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| VLVoltaix LLC | Mount Bethel | PA | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| WPWashington Penn Plas/arden | Washington | PA | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| WSWatson Standard Adhesives CO | Harwick | PA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| WSWatson Std Co/harwick | Harwick | PA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| WSWatson Std Co/neville Is | Neville Island | PA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| WTWeavertown Transport Leasing INC | Monaca | PA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
Western International Gas & Cylinders, INC. | Berwick | PA | Chemical Manufacturing325120 | — | ◇ UNVERIFIED |
| WCWhitford CORP | Frazer | PA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| WCWonder Chemical CORP | Fairless Hills | PA | Chemical Manufacturing325612 | — | ◇ UNVERIFIED |
| WAWuxi Apptec INC | Philadelphia | PA | Chemical Manufacturing325411 | — | ◇ UNVERIFIED |
| WPWyeth Pharmaceuticals/west Chester | West Chester | PA | Chemical Manufacturing325412 | — | ◇ UNVERIFIED |
| ALAbzena (Bristol) LLC | Bristol | PA | Chemical Manufacturing325412 | 100-499 | ◐ LIKELY ACTIVE |
| ALACP LabChem Inc | Zelienople | PA | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| AMAdvanced Materials and Catalysts LLC R&D | Conshohocken | PA | Chemical Manufacturing325180 | 20-99 | ◐ LIKELY ACTIVE |
| ATAGCCA Thorndale Plant | Downingtown | PA | Chemical Manufacturing325991 | 20-99 | ◐ LIKELY ACTIVE |
| ALAir Liquide Advanced Materials - Mount Bethel Facility | Mount Bethel | PA | Chemical Manufacturing325120 | 100-499 | ◐ LIKELY ACTIVE |
| ALAir Liquide Electronics Morrisville | Morrisville | PA | Chemical Manufacturing325120 | 100-499 | ◐ LIKELY ACTIVE |
| APAir Product and Chemicals Inc.- Creighton Facility | Creighton | PA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals, INC | Allentown | PA | Chemical Manufacturing325120 | — | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc APEX Division | Allentown | PA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc.- Bethlehem Terminal | Bethlehem | PA | Chemical Manufacturing325120 | 20-99 | ◐ LIKELY ACTIVE |
| ACAkdeniz Chemson | Philadelphia | PA | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| ANAkzo Nobel Coatings Inc. | Reading | PA | Chemical Manufacturing325510 | 100-499 | ◐ LIKELY ACTIVE |
| AAllentown | Allentown | PA | Food Manufacturing311119 | 100-499 | ◐ LIKELY ACTIVE |
| ALAlmirall LLC | Malvern | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| AAAlpha Aromatics | Pittsburgh | PA | Chemical Manufacturing325620 | 100-499 | ◐ LIKELY ACTIVE |
| APALTA Performance Materials - Neville Island | Pittsburgh | PA | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| APAlta Performance Materials US, LLC Philadelphia | Philadelphia | PA | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| ALAltuglas LLC | Bristol | PA | Chemical Manufacturing325211 | 100-499 | ◐ LIKELY ACTIVE |
| ALAmapharm LLC | Drums | PA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| ACAmerican Consolidated Manufacturing CO INC | Conshohocken | PA | Chemical Manufacturing325520 | — | ◐ LIKELY ACTIVE |
| ASAnesthesia Services and Products, INC. | Essington | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
Apex Water and Process, Inc. - York, PA | York | PA | Chemical Manufacturing325998 | 20-99 | ◐ LIKELY ACTIVE |
| AHAquaPhoenix Hanover HQ - PA | Hanover | PA | Chemical Manufacturing325998 | 100-499 | ◐ LIKELY ACTIVE |
| AWArxada Williamsport | Williamsport | PA | Chemical Manufacturing325199 | 100-499 | ◐ LIKELY ACTIVE |
| APAstraZeneca PLP | Philadelphia | PA | Chemical Manufacturing325414 | 100-499 | ◐ LIKELY ACTIVE |
| ADAurorium - Delaware Water Gap | Delaware Water Gap | PA | Chemical Manufacturing325199 | 20-99 | ◐ LIKELY ACTIVE |
| AMAvient - MTP | Mountain Top | PA | Chemical Manufacturing325991 | 1-19 | ◐ LIKELY ACTIVE |
| BCBeautyshea Cosmestic LLC | Philadelphia | PA | Chemical Manufacturing325620 | — | ◐ LIKELY ACTIVE |
| BPBehr Paint Company Allentown MFG | Allentown | PA | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |
| BBBethlehem Branch 67 | Bethlehem | PA | Chemical Manufacturing325120 | 1-19 | ◐ LIKELY ACTIVE |
| BFBethlehem Facility | Bethlehem | PA | Chemical Manufacturing325412 | 100-499 | ◐ LIKELY ACTIVE |
| BPBethlehem PA | Bethlehem | PA | Food Manufacturing311942 | 20-99 | ◐ LIKELY ACTIVE |
| BEBristol Engineering | Bristol | PA | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| BSBVPV Styrenics LLC - Beaver Valley Site | Monaca | PA | Chemical Manufacturing325211 | 20-99 | ◐ LIKELY ACTIVE |
| CLCAPS Lehigh Valley | Allentown | PA | Chemical Manufacturing325412 | 100-499 | ◐ LIKELY ACTIVE |
| CPCAPS Philadelphia | Horsham | PA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| CCha | Chalfont | PA | Chemical Manufacturing325412 | 20-99 | ◐ LIKELY ACTIVE |
| CVChemical Ventures INC | Richboro | PA | Chemical Manufacturing325611 | — | ◐ LIKELY ACTIVE |