| NANorth Amer Hoganas/johnstown Plt | Johnstown | — | ◐ LIKELY ACTIVE |
| PPPolymer Products CO INC | Stockertown | 20–99 | ◐ LIKELY ACTIVE |
| PDPraxair Distr Inc/ Morrisville | Morrisville | — | ◐ LIKELY ACTIVE |
| PAPrecision Assembly, INC | Willow Grove | 1–19 | ◐ LIKELY ACTIVE |
| PLPurolite LLC an Ecolab CO | Philadelphia | — | ◐ LIKELY ACTIVE |
| QEQnity Electronics Inc/towanda Plt | Towanda | — | ◐ LIKELY ACTIVE |
| RIReaxis INC | Mc Donald | — | ◐ LIKELY ACTIVE |
Reynolds Packaging Kama INC | Hazleton | — | ◐ LIKELY ACTIVE |
| SPSanofi Pasteur/swiftwater Fac | Swiftwater | — | ◐ LIKELY ACTIVE |
| SPSeward Power Plant | New Florence | — | ◐ LIKELY ACTIVE |
| SCShell Chemical Appalachia LLC | Monaca | — | ◐ LIKELY ACTIVE |
| SMSilberline Mfg CO - Lincoln Dr Plant | Tamaqua | — | ◐ LIKELY ACTIVE |
| SCSun Chem Corp/hunting Park Plt | Philadelphia | — | ◐ LIKELY ACTIVE |
| SSupelco | Bellefonte | — | ◐ LIKELY ACTIVE |
| STSylvin Technologies INC | Denver | — | ◐ LIKELY ACTIVE |
| TSThe Sherwin Williams Co/rochester Plt | Rochester | — | ◐ LIKELY ACTIVE |
| UUUnivar USA INC - Bunola Facility | Bunola | — | ◐ LIKELY ACTIVE |
| VIVerichem INC | Pittsburgh | — | ◐ LIKELY ACTIVE |
| VIVigon International LLC | East Stroudsburg | 100–499 | ◐ LIKELY ACTIVE |
| WCWhitford Corp/elverson | Elverson | — | ◐ LIKELY ACTIVE |
| WCWoodstream CORP Mfg | Lititz | — | ◐ LIKELY ACTIVE |
| WRW R Meadows of Pennsylvania | York | 20–99 | ◐ LIKELY ACTIVE |
| WLWsp Lock Haven Manufacturing Facility | Castanea | — | ◐ LIKELY ACTIVE |
| ARAerc Recycling Solutions a Clean Earth CO | Allentown | — | ◐ LIKELY ACTIVE |
| ACAlex C Fergusson INC | Chambersburg | — | ◐ LIKELY ACTIVE |
| ALArdex Laboratories INC | Philadelphia | — | ◐ LIKELY ACTIVE |
Calgon Carbon CORP - Neville Island Plt | Pittsburgh | — | ◐ LIKELY ACTIVE |
| CCCarpenter CO | Allentown | — | ◐ LIKELY ACTIVE |
| CICastek INC. | Berwick | — | ◐ LIKELY ACTIVE |
| CPChemstation Philadelphia | Downingtown | — | ◐ LIKELY ACTIVE |
| CAChemstream Altoona | Altoona | — | ◐ LIKELY ACTIVE |
| DCDow Chemical CO | Bristol | — | ◐ LIKELY ACTIVE |
| FIForce Industries | Paoli | — | ◐ LIKELY ACTIVE |
| JMJohnson Matthey INC Downingtown Site | Downingtown | — | ◐ LIKELY ACTIVE |
| KMKore Mart Limited | Hamburg | — | ◐ LIKELY ACTIVE |
| MAMcadoo & Allen Div Quaker Color Div Mcadoo & Allen Div | Quakertown | — | ◐ LIKELY ACTIVE |
| MEMorrisville Esg - Electronics Facility | Morrisville | — | ◐ LIKELY ACTIVE |
| NPNational Polymers INC | Charleroi | — | ◐ LIKELY ACTIVE |
| NLNorthtec Llc/bristol | Bristol | — | ◐ LIKELY ACTIVE |
| PCPolyone CORP | Bethlehem | — | ◐ LIKELY ACTIVE |
| PIPpg Ind/chem Tech Ctr | Monroeville | — | ◐ LIKELY ACTIVE |
| PIPpg Ind Inc/springdale | Springdale | — | ◐ LIKELY ACTIVE |
| ATAmg Titanium LLC | New Castle | — | ◇ UNVERIFIED |
| BIBimax INC | Glen Rock | — | ◇ UNVERIFIED |
| CCChase Corporation/blawnox | Blawnox | — | ◇ UNVERIFIED |
| CCChase CORP Zeta | Pittsburgh | — | ◇ UNVERIFIED |
| CIChemson INC | Philadelphia | — | ◇ UNVERIFIED |
| CSCronimet Specialty Metals USA INC - Suite 103 | Bedford | — | ◇ UNVERIFIED |
| GSGeo Specialty Chemicals Trimet Products Group | Allentown | — | ◇ UNVERIFIED |
| HUHenkel US Operations Corporation | West Hazleton | — | ◇ UNVERIFIED |