Knife River Prestress, INC | Newman Lake | 100–499 | ● ACTIVE |
Aaa Concrete, INC. | Spokane | 20–99 | ● ACTIVE |
Ellensburg Cement Products INC | Ellensburg | — | ● ACTIVE |
H2 Pre-cast, INC | E Wenatchee | — | ● ACTIVE |
Miles Sand & Gravel Company | Puyallup | — | ● ACTIVE |
Sigma Design, INC. | Camas | — | ● ACTIVE |
Aquatic Enterprises INC | Seattle | — | ● ACTIVE |
Automatic Wilbert Vault Co., INC. | Tacoma | — | ● ACTIVE |
Cascade Mobile Mix & Concrete Line Pumping LLC | Tacoma | — | ● ACTIVE |
| CCCemex Construction Materials Pacific, LLC | Spokane | — | ● ACTIVE |
Northwest Precast LLC | Puyallup | — | ● ACTIVE |
Spokane Wilbert Vault Company | Spokane | — | ● ACTIVE |
Summit Precast LLC | Puyallup | — | ● ACTIVE |
Xl Sci-tech INC | Richland | — | ● ACTIVE |
| SISpokane Industries | Spokane | 1–19 | ◐ LIKELY ACTIVE |
| BGBennu Glass LLC | Kalama | — | ◐ LIKELY ACTIVE |
| CWCentral Washington Concrete Baker Flats | East Wenatchee | — | ◐ LIKELY ACTIVE |
| CGCertainteed Gypsum Manufacturing | Seattle | — | ◐ LIKELY ACTIVE |
| CTConcrete Technology Corporation | Tacoma | 100–499 | ◐ LIKELY ACTIVE |
| FHFred Hill Materials Airport Plant | Bremerton | — | ◐ LIKELY ACTIVE |
| HCHot Cell Services CORP | Kent | — | ◐ LIKELY ACTIVE |
| LCLafarge Cement CO - Seattle Facility | Seattle | — | ◐ LIKELY ACTIVE |
| QSQuikrete - Seattle, Wa Plant | Tacoma | 20–99 | ◐ LIKELY ACTIVE |
| RSRec Solar Grade Silicon | Moses Lake | 100–499 | ◐ LIKELY ACTIVE |
| UGUS Gypsum Corporation Auburn | Auburn | 20–99 | ◐ LIKELY ACTIVE |
| APAir Products Mfg CORP Sea | Seattle | — | ◐ LIKELY ACTIVE |
| FPFrederickson Paver and Block Plant Site | Tacoma | — | ◐ LIKELY ACTIVE |
| GNGlacier Northwest INC Longview | Longview | — | ◐ LIKELY ACTIVE |
| GGGp Gypsum CORP Tacoma Plant | Tacoma | — | ◐ LIKELY ACTIVE |
| JHJames Hardie Building Products | Tacoma | — | ◐ LIKELY ACTIVE |
| MMMutual Materials Mica | Mica | — | ◐ LIKELY ACTIVE |
| CPCentral Pre Mix Concrete Products | Kent | — | ◇ UNVERIFIED |
| CPCentral Pre Mix Sullivan | Spokane | — | ◇ UNVERIFIED |
| CDCpm Development Crestline | Spokane | — | ◇ UNVERIFIED |
| FHFred Hill Materials | Poulsbo | — | ◇ UNVERIFIED |
| GNGlacier Northwest Chehalis Plant | Chehalis | — | ◇ UNVERIFIED |
| GNGlacier Northwest East Marginal Way | Seattle | — | ◇ UNVERIFIED |
| GNGlacier Northwest Vancouver | Vancouver | — | ◇ UNVERIFIED |
| GNGlacier Nw INC Vancouver Batch Plant | Vancouver | — | ◇ UNVERIFIED |
| GNGlacier Nw Kenmore | Kenmore | — | ◇ UNVERIFIED |
| GNGlacier Nw Woodland | Woodland | — | ◇ UNVERIFIED |
| UVUtility Vault | Auburn | — | ◇ UNVERIFIED |
| WSWenatchee Sandg Batch Plant | Wenatchee | — | ◇ UNVERIFIED |
| KIKyocera International INC | Vancouver | 100–499 | ▲ REPORTED CLOSED |
| CMCadman Materials INC | Everett | — | ◐ LIKELY ACTIVE |
| CGCardinal Glass Winlock | Winlock | — | ◐ LIKELY ACTIVE |
| CCCelite Corporation | Quincy | — | ◐ LIKELY ACTIVE |
| GWGraymont Western | Tacoma | — | ◐ LIKELY ACTIVE |
| HGHartung Glass Tukwila WA | Tukwila | 100–499 | ◐ LIKELY ACTIVE |
| PCPrecast Concrete LLC | Fife | 20–99 | ◐ LIKELY ACTIVE |