| HAHuntsman Advance Materials, LLC | Harrison City | — | ◇ UNVERIFIED |
| JPJr Peters INC | Allentown | — | ◇ UNVERIFIED |
| KTKitchenman Terminal Company | Fairless Hills | — | ◇ UNVERIFIED |
| LELake Erie Biofuels | Erie | — | ◇ UNVERIFIED |
| LCLtl Color Compounders Dev | Morrisville | — | ◇ UNVERIFIED |
| NINorth Industrial Chemicals INC | York | — | ◇ UNVERIFIED |
| OSOberg Stamping & Tech Center | Sarver | — | ◇ UNVERIFIED |
| OSOsram Sylvania Products INC. - Warren, Pa | Warren | — | ◇ UNVERIFIED |
| PDPraxair Distribution, INC. | Bethlehem | — | ◇ UNVERIFIED |
| PCPressure Chem Co/pgh | Pittsburgh | — | ◇ UNVERIFIED |
| RCRoyal Chemical | East Stroudsburg | — | ◇ UNVERIFIED |
| TCTaylor Chemical, INC. | Taylor | — | ◇ UNVERIFIED |
| TMTech Met INC | Donora | — | ◇ UNVERIFIED |
| TSThe Sherwin-williams CO | Pittsburgh | — | ◇ UNVERIFIED |
| TCTower Chemical Corporation | Easton | — | ◇ UNVERIFIED |
| VCValspar Coatings - Lebanon | Lebanon | — | ◇ UNVERIFIED |
| VDVertellus Dwg LLC | Delaware Water Gap | — | ◇ UNVERIFIED |
Acrymax Technologies INC. | Media | — | ◐ LIKELY ACTIVE |
| BIBuckman's Inc. | Pottstown | 100–499 | ◐ LIKELY ACTIVE |
| CPCustom Particle Solutions | Pipersville | — | ◐ LIKELY ACTIVE |
Encyclomedia INC | Philadelphia | — | ◐ LIKELY ACTIVE |
Game Face Products, INC. | East Stroudsburg | — | ◐ LIKELY ACTIVE |
| GLGenus Lifesciences INC | Allentown | — | ◐ LIKELY ACTIVE |
| GIGrimm Industries, INC. | Fairview | 100–499 | ◐ LIKELY ACTIVE |
Industrial Hydro Solutions LLC | Bernville | — | ◐ LIKELY ACTIVE |
Prochemtech International, INC | Brockway | — | ◐ LIKELY ACTIVE |
| APAxcentria Pharmaceuticals LLC | Telford | — | ◇ UNVERIFIED |
| HMHarry Miller CORP | Philadelphia | — | ◇ UNVERIFIED |
| MCMilazzo Company | Pittston | — | ◇ UNVERIFIED |
| NTNational Towelette Conmpany | Bensalem | — | ◇ UNVERIFIED |
| ALAir Liquide Advanced Materials - PA2 | Mount Bethel | 20–99 | ◐ LIKELY ACTIVE |
| ALAir Liquide Amer Corp/donora | Donora | — | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc.- Lancaster Facility | Lancaster | 20–99 | ◐ LIKELY ACTIVE |
| ASAlloy Surfaces Aston Plt | Chester | — | ◐ LIKELY ACTIVE |
| ALAlmatis Leetsdale Fac | Leetsdale | — | ◐ LIKELY ACTIVE |
| ACA&m Composting Fac | Manheim | — | ◐ LIKELY ACTIVE |
| ACAmerican Colloid Company - York PA | York | 20–99 | ◐ LIKELY ACTIVE |
| AFAndgrow Fertilizer Facility | East Berlin | — | ◐ LIKELY ACTIVE |
| AIArkema Inc. Birdsboro Plant | Birdsboro | 20–99 | ◐ LIKELY ACTIVE |
| ALArxada Llc/williamsport Plt | Williamsport | — | ◐ LIKELY ACTIVE |
| ASAscensus Specialties Callery LLC | Evans City | — | ◐ LIKELY ACTIVE |
| AIAstatech INC | Bristol | — | ◐ LIKELY ACTIVE |
| ACAtofina Chem Inc/king of Prussia | King of Prussia | — | ◐ LIKELY ACTIVE |
| BCBASF Corporation - Monaca Site | Monaca | 100–499 | ◐ LIKELY ACTIVE |
| BHBayer Healthcare | Myerstown | — | ◐ LIKELY ACTIVE |
| CPCarbonlite P LLC | Reading | — | ◐ LIKELY ACTIVE |
| CFCenter for Breakthrough Medicines - Building 29a | King of Prussia | — | ◐ LIKELY ACTIVE |
| CCChongs Clnr (y&m)/levittown | Levittown | — | ◐ LIKELY ACTIVE |
| CACollegeville Auto Body/collegeville | Collegeville | — | ◐ LIKELY ACTIVE |
| CNColorcon No Tox | Chalfont | 20–99 | ◐ LIKELY ACTIVE |