| DNDyno Nobel INC (donora Plant) | Donora | — | ◐ LIKELY ACTIVE |
| FGF Group Nano, LLC | Bellefonte | — | ◐ LIKELY ACTIVE |
| FTFiberglass Tech Inc/bristol | Levittown | — | ◐ LIKELY ACTIVE |
| FEFluid Energy Proc & Equip Hatfield Plt | Hatfield | — | ◐ LIKELY ACTIVE |
| FCFusion Coatings Inc/robesonia Plt | Robesonia | — | ◐ LIKELY ACTIVE |
| GMGlaxosmithkline/upper Merion East | King of Prussia | — | ◐ LIKELY ACTIVE |
| GCGrow Choice Ag INC Dba Brickers Choice Fertilizer | Marion | — | ◐ LIKELY ACTIVE |
| HCHydrol Chemical Company | Yeadon | — | ◐ LIKELY ACTIVE |
| IRIndependent Refining CO Llc/exeter | Pittston | — | ◐ LIKELY ACTIVE |
| JBJanssen Biotech INC | Malvern | — | ◐ LIKELY ACTIVE |
| KMKinder Morgan Arrow Terminal | Industry | — | ◐ LIKELY ACTIVE |
| KCKl Chempak, INC. | Lester | — | ◐ LIKELY ACTIVE |
| KIKoppers INC | Clairton | — | ◐ LIKELY ACTIVE |
| LCLanxess CORP | Burgettstown | — | ◐ LIKELY ACTIVE |
| LLLinde Llc/butler Plt | Butler | — | ◐ LIKELY ACTIVE |
| LMLockheed Martin Comm Space Sys Lmcss | Newtown | — | ◐ LIKELY ACTIVE |
| LCLord CORP. Industrial Products | Cambridge Springs | — | ◐ LIKELY ACTIVE |
| MEMaintenance Equipment & Chemicals INC | Nanty Glo | — | ◐ LIKELY ACTIVE |
| MHMasonic Homes/elizabethtown | Elizabethtown | — | ◐ LIKELY ACTIVE |
| MCMayflower Clnr/bensalem | Bensalem | — | ◐ LIKELY ACTIVE |
| NINetzsch INC | Exton | — | ◐ LIKELY ACTIVE |
| PIPolychemie INC. | Taylor | — | ◐ LIKELY ACTIVE |
| PPPrecision Polymer Prod/pottstown | Pottstown | — | ◐ LIKELY ACTIVE |
| PYProtech York | York | — | ◐ LIKELY ACTIVE |
| RLRadienz Living | Pittston | — | ◐ LIKELY ACTIVE |
| REReliant Energy Warren Station | Warren | — | ◐ LIKELY ACTIVE |
| RHRohm & Haas Co/bristol | Bristol | — | ◐ LIKELY ACTIVE |
| RHRohm & Haas Company | Philadelphia | — | ◐ LIKELY ACTIVE |
| SCSanyo Chem & Resin Inc/jefferson Site | West Elizabeth | — | ◐ LIKELY ACTIVE |
| SWSherwin Williams Mfg Co/lebanon Plt | Lebanon | — | ◐ LIKELY ACTIVE |
| SBSmithkline Beecham Pharmaceuticals INC | King of Prussia | — | ◐ LIKELY ACTIVE |
| SAStraight Arrow Products, INC | Bethlehem | — | ◐ LIKELY ACTIVE |
| TBTetlp - Bechtelsville | Barto | — | ◐ LIKELY ACTIVE |
| TFTredegar Film Prod Inc/pottsville | Mar Lin | — | ◐ LIKELY ACTIVE |
| UPUltra Poly CORP - Portland | Portland | — | ◐ LIKELY ACTIVE |
| URUnion Roto-graving/quakertown | Quakertown | — | ◐ LIKELY ACTIVE |
| UCUnited Color Manufacturing INC | Philadelphia | — | ◐ LIKELY ACTIVE |
| WPWashington Penn Plas/v-bat | Washington | — | ◐ LIKELY ACTIVE |
| WRW R Meadows of Pennsylvania | York | — | ◐ LIKELY ACTIVE |
| ZFZambelli Fireworks Mfg CO | Edinburg | — | ◐ LIKELY ACTIVE |
| AIAccupac, INC. | Lansdale | — | ◇ UNVERIFIED |
| ATAdvanced Therapies, LLC | Philadelphia | — | ◇ UNVERIFIED |
| AIAffival INC | Oakmont | — | ◇ UNVERIFIED |
| ATAgraco Technologies International | Dillsburg | — | ◇ UNVERIFIED |
| ALAir Liquide Advanced Materials | Mount Bethel | — | ◇ UNVERIFIED |
| ALAir Liquide America CORP Coatesville Asu | Coatesville | — | ◇ UNVERIFIED |
| APAir Prod & Chem | Morrisville | — | ◇ UNVERIFIED |
| APAir Products and Chemicals, INC. | Creighton | — | ◇ UNVERIFIED |
| APAir Products Ecd | Easton | — | ◇ UNVERIFIED |
| ACAllegheny Chemical CORP | Ridgway | — | ◇ UNVERIFIED |