| OSOregon Steel Mills LLC | Portland | — | ● ACTIVE |
 Oil Re-refining Company INC. | Portland | — | ● ACTIVE |
 Chevron U.s.a. INC. | Portland | — | ● ACTIVE |
 Enviroad LLC | Portland | — | ● ACTIVE |
| OCOwens Corning Portland Roofing Plant | Portland | 100–499 | ◐ LIKELY ACTIVE |
| CPChevron Products CO Willbridge | Portland | — | ◐ LIKELY ACTIVE |
| OTOwens-corning Trumbull Asphalt Linnton Plant | Portland | — | ◐ LIKELY ACTIVE |
| P6Phillips 66 Pipeline Portland Terminal & Lubricants | Portland | — | ◐ LIKELY ACTIVE |
| CCertainteed | Portland | — | ◇ UNVERIFIED |
| EHEvraz Heat Treating | Portland | — | ◇ UNVERIFIED |
| KRKnife River Sundial Concrete | Troutdale | — | ◇ UNVERIFIED |
| MRMalarkey Roofing Products | Portland | — | ◇ UNVERIFIED |
| TLTarr, LLC | Portland | — | ◇ UNVERIFIED |
| MOMerit Oil Fuel Processors | Portland | — | ◐ LIKELY ACTIVE |
| PSPennzoil-quaker State CO Dba Sopus Products-portland | Portland | — | ◐ LIKELY ACTIVE |
| SPSeaport Portland Terminal | Portland | — | ◐ LIKELY ACTIVE |
| ZEZenith Energy Terminals Holdings LLC - Portland Terminal | Portland | — | ◐ LIKELY ACTIVE |
| COChristenson Oil | Portland | — | ◇ UNVERIFIED |
| EREcolube Recovery | Portland | — | ◇ UNVERIFIED |
| JUJw Underground Enterprises | Gresham | — | ◇ UNVERIFIED |
| LILakeside Industries INC | Portland | — | ◇ UNVERIFIED |
| PWPorter W Yett Company | Portland | — | ◇ UNVERIFIED |
| SESpencer Environmental | Portland | — | ◇ UNVERIFIED |
| TFThermo Fluids Portland | Portland | — | ◇ UNVERIFIED |
| WPWastech Processing and Recovery Center | Portland | — | ◇ UNVERIFIED |
| ZMZidell Marine Corporation | Portland | — | ◇ UNVERIFIED |
| DCDownstream & Chemicals - Portland, OR Lubricants Plant | Portland | 20–99 | ◐ LIKELY ACTIVE |
| OCOwens Corning Linnton Asphalt Planrt | Portland | 20–99 | ◐ LIKELY ACTIVE |
| PPortland | Portland | 1–19 | ◐ LIKELY ACTIVE |
| PLPortland Lubricants | Portland | 1–19 | ◐ LIKELY ACTIVE |
| PRPortland Refinery | Portland | 20–99 | ◐ LIKELY ACTIVE |
| COCarson Oil Portland | Portland | — | ◇ UNVERIFIED |
| CACustom Asphalt Products Corporation | Portland | — | ◇ UNVERIFIED |
| DCDan's Corporations 2016 LLC | Troutdale | — | ◇ UNVERIFIED |
| EPExxonmobil Portland Regional Distribution Center | Portland | — | ◇ UNVERIFIED |
| HMHerbert Malarkey Roofing Company | Portland | — | ◇ UNVERIFIED |
| LILakeside Industries, INC. | Portland | — | ◇ UNVERIFIED |
| MRMalarkey Roofing Company | Portland | — | ◇ UNVERIFIED |
| RGRed Giant Oil Company LLC | Portland | — | ◇ UNVERIFIED |
| RIRoss Island Sand & Gravel CO | Portland | — | ◇ UNVERIFIED |
| UPUS Postal Service | Portland | — | ◇ UNVERIFIED |
