| CMClearfield Metal Tech/clearfield Plt | Clearfield | — | ◐ LIKELY ACTIVE |
| CSCoatesville Scrap Iron & Metal Fac | Coatesville | — | ◐ LIKELY ACTIVE |
| CFCochrane Foundry INC | York | 1–19 | ◐ LIKELY ACTIVE |
| CRColumbia Reduction CO | Columbia | — | ◐ LIKELY ACTIVE |
| EREllwood Remelt Steel Proposed Var/esr Facility | New Castle, City of | — | ◐ LIKELY ACTIVE |
| GSGardner Steel Corporation | New Castle | 1–19 | ◐ LIKELY ACTIVE |
| KMKalas Manufacturing Plant 3 | Denver | — | ◐ LIKELY ACTIVE |
| KIKennametal Isa | New Castle | — | ◐ LIKELY ACTIVE |
| LSLane Steel Co., INC. | Mc Kees Rocks | 100–499 | ◐ LIKELY ACTIVE |
Luxfer Magtech Inc/tamaqua | Tamaqua | — | ◐ LIKELY ACTIVE |
| MPMetalico Pgh INC | Pittsburgh | — | ◐ LIKELY ACTIVE |
| MPMetal Powder Prod/st Marys | Saint Marys | — | ◐ LIKELY ACTIVE |
| MAMj Associates Steel Co., INC. | Philadelphia | 20–99 | ◐ LIKELY ACTIVE |
| NSNatl Std Impoundment | Mount Joy | — | ◐ LIKELY ACTIVE |
| NLNavitus LLC | Bellefonte | — | ◐ LIKELY ACTIVE |
| PIPace Industries | Loyalhanna | — | ◐ LIKELY ACTIVE |
| PTPlymouth Tube | Horsham | — | ◐ LIKELY ACTIVE |
| RBRhoads Building 57 | Philadelphia | — | ◐ LIKELY ACTIVE |
| SWSeverstal Wheeling/allenport | Allenport | — | ◐ LIKELY ACTIVE |
| TSTech Spec Inc/derry | Derry | — | ◐ LIKELY ACTIVE |
| VCVictaulic Co/lawrenceville Plt | Tioga | — | ◐ LIKELY ACTIVE |
| WMWard Manufacturing, LLC | Blossburg | 100–499 | ◐ LIKELY ACTIVE |
| WHWest Homestead Engineering & Machine | Pittsburgh | 100–499 | ◐ LIKELY ACTIVE |
| WTWheatland Tube Council Ave Plt/wheatland Tube LLC | Wheatland | — | ◐ LIKELY ACTIVE |
| WWhemco/midland | Midland | — | ◐ LIKELY ACTIVE |
| ARAg-met Refining CORP | Delano | — | ◇ UNVERIFIED |
| APAir Products & Chemicals INC | Lancaster | — | ◇ UNVERIFIED |
| ANAkers Natl Roll Co/hyde Park Foundry | Hyde Park | — | ◇ UNVERIFIED |
| ASAk Steel Butler Works | Butler | — | ◇ UNVERIFIED |
| ALAllegheny Ludlum CORP | Houston | — | ◇ UNVERIFIED |
| ALAllegheny Ludlum Cor/washington Flatroll | Washington | — | ◇ UNVERIFIED |
| ALAllegheny Ludlum Llc/houston Fitch Works | Houston | — | ◇ UNVERIFIED |
| AMAmeri-precision Metals Inc/canonsburg Fac | Canonsburg | — | ◇ UNVERIFIED |
| BMBardane Mfg Co/jermyn Plt | Jermyn | — | ◇ UNVERIFIED |
| BFBeaver Falls Tubular Prodllc/beaver Falls Plt | Beaver Falls | — | ◇ UNVERIFIED |
| BSBigbee Steel & Tank CO | Manheim | — | ◇ UNVERIFIED |
| BFBoyertown Foundry Co/fka Eafco | New Berlinville | — | ◇ UNVERIFIED |
| BBBrass & Bronze Casting CO | Irwin | — | ◇ UNVERIFIED |
| BABridon American CORP | Exeter | — | ◇ UNVERIFIED |
| BEBrighton Electric Steel Casting CO | Beaver Falls | — | ◇ UNVERIFIED |
| BEBrubacher Excavating INC | Bowmansville | — | ◇ UNVERIFIED |
| BSBudd Site | Philadelphia | — | ◇ UNVERIFIED |
| CICarson Ind/freeport | Freeport | — | ◇ UNVERIFIED |
| CWCavert Wire | Lemont Furnace | — | ◇ UNVERIFIED |
| CMChevron Molycorp Washington Remediation Proj | Washington | — | ◇ UNVERIFIED |
| CMClearfield Mach Co/3rd & Everett Streets | Clearfield | — | ◇ UNVERIFIED |
| CFCol Fin Specialty Steel Mfg | New Brighton | — | ◇ UNVERIFIED |
| CCContech Const Prod - Greencastle | Greencastle | — | ◇ UNVERIFIED |
| DBDamascus Bishop Tube/greenville | Greenville | — | ◇ UNVERIFIED |
| DDDemorah Drive Associates | Montgomeryville | — | ◇ UNVERIFIED |