| SVSpring Valley Mulch | Dover | — | ◇ UNVERIFIED |
| SHStandard Homeopathic Company | King of Prussia | — | ◇ UNVERIFIED |
| SAStonehouse Acquisition CO Llc/chambersburg | Chambersburg | — | ◇ UNVERIFIED |
| SCStoney Creek Technologies LLC | Marcus Hook | — | ◇ UNVERIFIED |
| SPStrand Pool Supply, LLP | Bartonsville | — | ◇ UNVERIFIED |
| SPSunoco Partners Mkt & Term Lp/hog Island | Tinicum | — | ◇ UNVERIFIED |
| SPSunoco Partners M & T - Beaver Terminal | Vanport | — | ◇ UNVERIFIED |
| SBSylvan Bioproducts, INC. | Kittanning | — | ◇ UNVERIFIED |
| TBTetlp Bernville Compressor Station | Robesonia | — | ◇ UNVERIFIED |
| TMTetlp Mlv Ln 12 Mp 197.15 Blue Marsh West | Robesonia | — | ◇ UNVERIFIED |
| TMTetlp Mlv Ln 12 Mp 199.23 Blue Marsh East | Bernville | — | ◇ UNVERIFIED |
| TETherm-o-rock East INC | Donora | — | ◇ UNVERIFIED |
| TLTroy Laundry & Dry Clnr/carlisle | Carlisle | — | ◇ UNVERIFIED |
| TMTroy Manufacturing, INC. | Hazleton | — | ◇ UNVERIFIED |
| UAUpmc Altoona/7th Avenue Campus Former Bon Secours | Altoona | — | ◇ UNVERIFIED |
| VFVanguard / Frazer | Frazer | — | ◇ UNVERIFIED |
| VHVertellus Health & Specialty Products LLC | Delaware Water Gap | — | ◇ UNVERIFIED |
| VIVigon International LLC | East Stroudsburg | — | ◇ UNVERIFIED |
| VLVoltaix LLC | Mount Bethel | — | ◇ UNVERIFIED |
| WPWashington Penn Plas/arden | Washington | — | ◇ UNVERIFIED |
| WSWatson Standard Adhesives CO | Harwick | — | ◇ UNVERIFIED |
| WSWatson Std Co/harwick | Harwick | — | ◇ UNVERIFIED |
| WSWatson Std Co/neville Is | Neville Island | — | ◇ UNVERIFIED |
| WTWeavertown Transport Leasing INC | Monaca | — | ◇ UNVERIFIED |
 Western International Gas & Cylinders, INC. | Berwick | — | ◇ UNVERIFIED |
| WCWhitford CORP | Frazer | — | ◇ UNVERIFIED |
| WCWonder Chemical CORP | Fairless Hills | — | ◇ UNVERIFIED |
| WAWuxi Apptec INC | Philadelphia | — | ◇ UNVERIFIED |
| WPWyeth Pharmaceuticals/west Chester | West Chester | — | ◇ UNVERIFIED |
| 1S12th St | Allentown | 20–99 | ◐ LIKELY ACTIVE |
| 1S1PHL Sun Chemical | Philadelphia | 20–99 | ◐ LIKELY ACTIVE |
| ALAbzena (Bristol) LLC | Bristol | 100–499 | ◐ LIKELY ACTIVE |
| ALACP LabChem Inc | Zelienople | 20–99 | ◐ LIKELY ACTIVE |
| AMAdvanced Materials and Catalysts LLC R&D | Conshohocken | 20–99 | ◐ LIKELY ACTIVE |
| AFAdvanSix - Frankford Plant | Philadelphia | 100–499 | ◐ LIKELY ACTIVE |
| ACAFCO - Chambersburg | Chambersburg | 20–99 | ◐ LIKELY ACTIVE |
| ATAGCCA Thorndale Plant | Downingtown | 20–99 | ◐ LIKELY ACTIVE |
| ALAir Liquide Advanced Materials - Mount Bethel Facility | Mount Bethel | 100–499 | ◐ LIKELY ACTIVE |
| ALAir Liquide Electronics Morrisville | Morrisville | 100–499 | ◐ LIKELY ACTIVE |
| APAir Product and Chemicals Inc.- Creighton Facility | Creighton | 20–99 | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals, INC | Allentown | — | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc APEX Division | Allentown | 20–99 | ◐ LIKELY ACTIVE |
| APAir Products and Chemicals Inc.- Bethlehem Terminal | Bethlehem | 20–99 | ◐ LIKELY ACTIVE |
| ACAkdeniz Chemson | Philadelphia | 20–99 | ◐ LIKELY ACTIVE |
| ANAkzo Nobel Coatings Inc. | Reading | 100–499 | ◐ LIKELY ACTIVE |
| AAllentown | Allentown | 100–499 | ◐ LIKELY ACTIVE |
| ASAlloy Surfaces CO INC | Aston | — | ◐ LIKELY ACTIVE |
| ALAlltrista LLC | Reedsville | 100–499 | ◐ LIKELY ACTIVE |
| ALAlmirall LLC | Malvern | — | ◐ LIKELY ACTIVE |
| APAlpek Polyester USA LLC | Reading | 100–499 | ◐ LIKELY ACTIVE |
