| PQPennzoil Quaker State | Rouseville | — | ◇ UNVERIFIED |
| PSPennzoil-quaker State CO | Reno | — | ◇ UNVERIFIED |
| PRPetroleum Recycling CORP | Philadelphia | — | ◇ UNVERIFIED |
| PCPetromax Carnegie Plt | Carnegie | — | ◇ UNVERIFIED |
| PPPitt Penn Recycling LLC | Creighton | — | ◇ UNVERIFIED |
| PWP & W Excavating, INC. | Warfordsburg | — | ◇ UNVERIFIED |
| QSQuaker Sales Corp/johnstown Asphalt Plt | Johnstown | — | ◇ UNVERIFIED |
| QSQuaker Sales Corp/northern Cambria | Barnesboro | — | ◇ UNVERIFIED |
| QSQuaker Sales Corp/northern Cambria | Northern Cambria | — | ◇ UNVERIFIED |
| RERidge Energy CO INC | Clymer | — | ◇ UNVERIFIED |
| SKSafety Kleen Sys INC - Kuhnsville Facility | Allentown | — | ◇ UNVERIFIED |
| SSSharon Steel CORP (farrell Works Disposal Area) | Hermitage | — | ◇ UNVERIFIED |
| SPSharp Paving Inc/shelocta Asphalt Plt | Shelocta | — | ◇ UNVERIFIED |
| SIShenango Incorporated | Pittsburgh | — | ◇ UNVERIFIED |
| SASummit Anthracite Inc/porter Twp | Good Spring | — | ◇ UNVERIFIED |
| SPSunoco Partners Mkt & Term LP Darby Creek Tank Farm | Darby | — | ◇ UNVERIFIED |
| TLThe Lane Construction Corporation | Springdale | — | ◇ UNVERIFIED |
| TCThermal Clean Soil Proc Fac | Washington | — | ◇ UNVERIFIED |
| URUnited Refinery Springdale Terminal | Springdale | — | ◇ UNVERIFIED |
| VNValley Natl Gases Wv Llc/west Mifflin | West Mifflin | — | ◇ UNVERIFIED |
| WSWindsor Service INC | Reading | — | ◇ UNVERIFIED |
| WJW J & B Asphalt Co/east Huntingdon | Scottdale | — | ◇ UNVERIFIED |
| WDWl Dunn Const Co/e Fairfield | Cochranton | — | ◇ UNVERIFIED |
| YBYork Bldg Prod CO Inc/thomasville | Thomasville | — | ◇ UNVERIFIED |
| ZEZenith Energy/belle Vernon | Belle Vernon | — | ◇ UNVERIFIED |
| AEAero Energy | New Oxford | 100–499 | ◐ LIKELY ACTIVE |
Allegheny Petroleum Products Company - Ambridge | Ambridge | 20–99 | ◐ LIKELY ACTIVE |
| ARAmerican Refining Group- Bradford | Bradford | 100–499 | ◐ LIKELY ACTIVE |
| ARAshcom RMC Plant | Everett | 1–19 | ◐ LIKELY ACTIVE |
| BHBath HMA Plant | Bath | 1–19 | ◐ LIKELY ACTIVE |
| CHCamp Hill HMA Plant | Camp Hill | 1–19 | ◐ LIKELY ACTIVE |
| CHChambersburg HMA Plant | Chambersburg | 1–19 | ◐ LIKELY ACTIVE |
| CCCleveland Cliffs Monessen | Monessen | 100–499 | ◐ LIKELY ACTIVE |
| CHClifford HMA Plant | Lenoxville | 1–19 | ◐ LIKELY ACTIVE |
| DHDenver HMA Plant | Denver | 1–19 | ◐ LIKELY ACTIVE |
| EHElizabethville HMA Plant | Elizabethville | 1–19 | ◐ LIKELY ACTIVE |
| FCFBC Chemical Corporation - Mars | Mars | 20–99 | ◐ LIKELY ACTIVE |
| GHGettysburg HMA Plant | Gettysburg | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials Downingtown HMA | Downingtown | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials Frazer HMA | Frazer | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials Glen Mills HMA | Glen Mills | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials Lititz HMA | Lititz | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials Penns Park HMA | Newtown | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials Perkiomenville HMA | Perkiomenville | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials Plymouth Meeting HMA | Plymouth Meeting | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials St Thomas | Saint Thomas | 1–19 | ◐ LIKELY ACTIVE |
| HMHeidelberg Materials Wrightsville HMA | Wrightsville | 1–19 | ◐ LIKELY ACTIVE |
| HPHFSinclair-Petrolia Plant (formerly Sonneborn) | Petrolia | 100–499 | ◐ LIKELY ACTIVE |
| HHHinkletown HMA Plant | Ephrata | 1–19 | ◐ LIKELY ACTIVE |
| IWInternational Waxes, Inc. | Smethport | 100–499 | ◐ LIKELY ACTIVE |