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| SPSanofi Pasteur/swiftwater Fac | Swiftwater | PA | Chemical Manufacturing325412 | — | ◐ LIKELY ACTIVE |
| SPSeward Power Plant | New Florence | PA | Chemical Manufacturing325610 | — | ◐ LIKELY ACTIVE |
| SCShell Chemical Appalachia LLC | Monaca | PA | Chemical Manufacturing325110 | — | ◐ LIKELY ACTIVE |
| SMSilberline Mfg CO - Lincoln Dr Plant | Tamaqua | PA | Chemical Manufacturing325130 | — | ◐ LIKELY ACTIVE |
| SCSun Chem Corp/hunting Park Plt | Philadelphia | PA | Chemical Manufacturing325910 | — | ◐ LIKELY ACTIVE |
| SSupelco | Bellefonte | PA | Chemical Manufacturing325199 | — | ◐ LIKELY ACTIVE |
| STSylvin Technologies INC | Denver | PA | Chemical Manufacturing325991 | — | ◐ LIKELY ACTIVE |
| TSThe Sherwin Williams Co/rochester Plt | Rochester | PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| UUUnivar USA INC - Bunola Facility | Bunola | PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| VIVerichem INC | Pittsburgh | PA | Chemical Manufacturing325320 | — | ◐ LIKELY ACTIVE |
| VIVigon International LLC | East Stroudsburg | PA | Chemical Manufacturing325199 | 100-499 | ◐ LIKELY ACTIVE |
| WCWhitford Corp/elverson | Elverson | PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
| WCWoodstream CORP Mfg | Lititz | PA | Chemical Manufacturing325320 | — | ◐ LIKELY ACTIVE |
| WRW R Meadows of Pennsylvania | York | PA | Chemical Manufacturing325510 | 20-99 | ◐ LIKELY ACTIVE |
| WLWsp Lock Haven Manufacturing Facility | Castanea | PA | Chemical Manufacturing325110 | — | ◐ LIKELY ACTIVE |
| ARAerc Recycling Solutions a Clean Earth CO | Allentown | PA | Chemical Manufacturing325180 | — | ◐ LIKELY ACTIVE |
| ACAlex C Fergusson INC | Chambersburg | PA | Chemical Manufacturing325611 | — | ◐ LIKELY ACTIVE |
| ALArdex Laboratories INC | Philadelphia | PA | Chemical Manufacturing325612 | — | ◐ LIKELY ACTIVE |
Calgon Carbon CORP - Neville Island Plt | Pittsburgh | PA | Chemical Manufacturing325110 | — | ◐ LIKELY ACTIVE |
| CCCarpenter CO | Allentown | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
| CICastek INC. | Berwick | PA | Chemical Manufacturing325211 | — | ◐ LIKELY ACTIVE |
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| CAChemstream Altoona | Altoona | PA | Chemical Manufacturing325998 | — | ◐ LIKELY ACTIVE |
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| FIForce Industries | Paoli | PA | Chemical Manufacturing325199 | — | ◐ LIKELY ACTIVE |
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| KMKore Mart Limited | Hamburg | PA | Chemical Manufacturing325510 | — | ◐ LIKELY ACTIVE |
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| NLNorthtec Llc/bristol | Bristol | PA | Chemical Manufacturing325130 | — | ◐ LIKELY ACTIVE |
| PCPolyone CORP | Bethlehem | PA | Chemical Manufacturing325991 | — | ◐ LIKELY ACTIVE |
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| BIBimax INC | Glen Rock | PA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| CCChase Corporation/blawnox | Blawnox | PA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| CCChase CORP Zeta | Pittsburgh | PA | Chemical Manufacturing325510 | — | ◇ UNVERIFIED |
| CIChemson INC | Philadelphia | PA | Chemical Manufacturing325998 | — | ◇ UNVERIFIED |
| CSCronimet Specialty Metals USA INC - Suite 103 | Bedford | PA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| GSGeo Specialty Chemicals Trimet Products Group | Allentown | PA | Chemical Manufacturing325110 | — | ◇ UNVERIFIED |
| HUHenkel US Operations Corporation | West Hazleton | PA | Chemical Manufacturing325611 | — | ◇ UNVERIFIED |
| HAHuntsman Advance Materials, LLC | Harrison City | PA | Chemical Manufacturing325211 | — | ◇ UNVERIFIED |
| JPJr Peters INC | Allentown | PA | Chemical Manufacturing325311 | — | ◇ UNVERIFIED |
| KTKitchenman Terminal Company | Fairless Hills | PA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| LELake Erie Biofuels | Erie | PA | Chemical Manufacturing325199 | — | ◇ UNVERIFIED |
| LCLtl Color Compounders Dev | Morrisville | PA | Chemical Manufacturing325991 | — | ◇ UNVERIFIED |
| NINorth Industrial Chemicals INC | York | PA | Chemical Manufacturing325180 | — | ◇ UNVERIFIED |
| OSOberg Stamping & Tech Center | Sarver | PA | Chemical Manufacturing325320 | — | ◇ UNVERIFIED |