| KLKeystone Lime Company | Fort Hill | — | ◐ LIKELY ACTIVE |
| LHLaflin HMA Plant | Laflin | 1–19 | ◐ LIKELY ACTIVE |
| LRLeesport RMC Plant | Leesport | 1–19 | ◐ LIKELY ACTIVE |
| LHLewisburg HMA Plant | Lewisburg | 1–19 | ◐ LIKELY ACTIVE |
| LPLocust Point RMC Plant | Mechanicsburg | 1–19 | ◐ LIKELY ACTIVE |
| MCMid-atlantic Cooperative Solutions, INC. | New Oxford | — | ◐ LIKELY ACTIVE |
| MMyerstown | Myerstown | 500+ | ◐ LIKELY ACTIVE |
| PNPennStar - Northampton | Northampton | 20–99 | ◐ LIKELY ACTIVE |
| PSPmg Sm Pa, LLC | Allentown | 20–99 | ◐ LIKELY ACTIVE |
| PUPolyglass USA Inc. Hazleton | Hazleton | 100–499 | ◐ LIKELY ACTIVE |
| QCQuaker Chemical Corporation | Conshohocken | — | ◐ LIKELY ACTIVE |
| QHQuaker Houghton Pa, INC | Conshohocken | — | ◐ LIKELY ACTIVE |
| QCQuality Control Eastern PA | Leesport | 20–99 | ◐ LIKELY ACTIVE |
| QCQuality Control Western PA | New Enterprise | 20–99 | ◐ LIKELY ACTIVE |
| RIRichardsApex, Inc | Philadelphia | 20–99 | ◐ LIKELY ACTIVE |
| RSRoaring Spring HMA Plant | Roaring Spring | 1–19 | ◐ LIKELY ACTIVE |
| RPRochester Packaging Plant | Rochester | 20–99 | ◐ LIKELY ACTIVE |
| SOSealMaster of PA, Inc. | Hillsville | 20–99 | ◐ LIKELY ACTIVE |
| SHSomerset HMA Plant | Somerset | 1–19 | ◐ LIKELY ACTIVE |
| SLStaar Lubricants LLC | Reynoldsville | — | ◐ LIKELY ACTIVE |
| SHSteelton HMA Plant | Steelton | 1–19 | ◐ LIKELY ACTIVE |
| TRTarco Roofing Materials | Greencastle | 20–99 | ◐ LIKELY ACTIVE |
| TPTitusville Plant | Titusville | 20–99 | ◐ LIKELY ACTIVE |
| THTyrone HMA Plant | Tyrone | 1–19 | ◐ LIKELY ACTIVE |
| URUnited Refining Company | Warren | 500+ | ◐ LIKELY ACTIVE |
| WHWescoville HMA Plant | Allentown | 1–19 | ◐ LIKELY ACTIVE |
| 1P12 Plant Area Cleanup | Marcus Hook | — | ◇ UNVERIFIED |
| AAAmer Asphalt Paving Co/east Falls Plt | Falls | — | ◇ UNVERIFIED |
| BCB Carmichael Enterprises INC | Ridley Park | — | ◇ UNVERIFIED |
| BMBldg Materials Mfg Corp/erie | Erie | — | ◇ UNVERIFIED |
| CLCalumet Lubricants Co/rouseville Plt | Rouseville | — | ◇ UNVERIFIED |
| CRCj Robinson Company, INC. | East Greenville | — | ◇ UNVERIFIED |
| DGDalrymple Gravel & Contr/bradford Cnty Plt | Sayre | — | ◇ UNVERIFIED |
| DSD.a. Stuart Company | Verona | — | ◇ UNVERIFIED |
| DCDerry Const CO Inc/torrance Plt | Torrance | — | ◇ UNVERIFIED |
| FCFolino Construction | Coraopolis | — | ◇ UNVERIFIED |
| GSGlacial Sand & Gravel/bridgeburg Coal Tipple | Adrian | — | ◇ UNVERIFIED |
| GOGlenn O Hawbaker Inc/asphalt Plt Grove City | Grove City | — | ◇ UNVERIFIED |
| GOGlenn O Hawbaker Inc/turtlepoint | Turtlepoint | — | ◇ UNVERIFIED |
| HKHaines & Kibblehouse/dunmore Materials | Dunmore | — | ◇ UNVERIFIED |
| HKHaines & Kibblehouse Locust Ridge Asphalt | Pocono Lake | — | ◇ UNVERIFIED |
| HAHanson Aggregrates Bmc, INC. | Eighty Four | — | ◇ UNVERIFIED |
| HRHawbaker Recycling Center Stormwater Pag-03 | State College | — | ◇ UNVERIFIED |
| HMHighway Materials Inc/nazareth Asphalt Plt | Nazareth | — | ◇ UNVERIFIED |
| HCHumphrey Charcoal, INC. | Brookville | — | ◇ UNVERIFIED |
| ICIa Const Corp/jackson Twp Plt | Zelienople | — | ◇ UNVERIFIED |
| ICIa Construction Gibsonia | Gibsonia | — | ◇ UNVERIFIED |
| KDK. Dolan Corporation | Blairsville | — | ◇ UNVERIFIED |
| KMKoch Materials CO | Northumberland | — | ◇ UNVERIFIED |
| KMKoch Materials CO. | York | — | ◇ UNVERIFIED |