| CPCentral Pre-mix Concrete Company Yakima | Yakima | — | ◇ UNVERIFIED |
| CWCentral Washington Concrete Ephrata | Ephrata | — | ◇ UNVERIFIED |
| CIConrad Industries | Chehalis | — | ◇ UNVERIFIED |
| CBCreston Biodiesel Refinery | Creston | — | ◇ UNVERIFIED |
| FCFields Corporation Site | Kent | — | ◇ UNVERIFIED |
| GIGardner-fields, INC. Facility #13 | Tacoma | — | ◇ UNVERIFIED |
| GCGranite Construction Company Omak | Okanogan | — | ◇ UNVERIFIED |
| ILInternational Lubricants INC | Seattle | — | ◇ UNVERIFIED |
| LILakeside Industries Aberdeen | Aberdeen | — | ◇ UNVERIFIED |
| LILakeside Industries Issaquah 032 | Issaquah | — | ◇ UNVERIFIED |
| LILakeside Industries Little Monroe | Monroe | — | ◇ UNVERIFIED |
| LILakeside Industries Olympia Airport | Olympia | — | ◇ UNVERIFIED |
| LILavinal INC | Cle Elum | — | ◇ UNVERIFIED |
| LLLloyd Logging Mack Lloyd Pit | Winthrop | — | ◇ UNVERIFIED |
| LBLP Body Shop INC | Yakima | — | ◇ UNVERIFIED |
| MVMarine Vacuum Service INC | Seattle | — | ◇ UNVERIFIED |
| MTMitchell Trucking and Paving Mitchell | Orondo | — | ◇ UNVERIFIED |
| NYNewport Yacht Basin | Bellevue | — | ◇ UNVERIFIED |
| NCNorth Central Construction | Moses Lake | — | ◇ UNVERIFIED |
| OROil Re Refining CO INC - Kennewick Facility | Kennewick | — | ◇ UNVERIFIED |
| RCRoadway Construction | Tacoma | — | ◇ UNVERIFIED |
| SISecon, Inc./stansteel 3000 | Bellevue | — | ◇ UNVERIFIED |
| TITreoil Industries | Ferndale | — | ◇ UNVERIFIED |
| WAWatson Asphalt Paving CO INC | Kanaskat | — | ◇ UNVERIFIED |
| WAWatson Asphalt Paving CO INC | Redmond | — | ◇ UNVERIFIED |
| WBWhatcom Builders INC | Bellingham | — | ◇ UNVERIFIED |
| WAWoodworth and Company INC | Lakewood | — | ◇ UNVERIFIED |
| BMBardahl Manufacturing Corporation | Seattle | 20–99 | ◐ LIKELY ACTIVE |
| ESEmerald Services Inc 76ETO | Tacoma | 20–99 | ◐ LIKELY ACTIVE |
| PRPABCO Roofing - Tacoma | Tacoma | 100–499 | ◐ LIKELY ACTIVE |
