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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| W-5 Excavation, Inc. | Williston, ND | — | Installer | — |
| Wbh, Llc. | MinnewaukanND, ND | — | Installer | — |
| WBP Contracting | Williston, ND | — | Installer | — |
| Western Municipal Construction of Wyoming, Inc. | Meeteetse, WY | — | Installer | — |
| White Horse Construction | New Town, ND | — | Installer | — |
| Wild Prairie Solutions LLC | Max, ND | — | Installer | — |
| Willey's Septic Service | Ypsilanti, ND | Stutsman | Pumper (Class I) | NDSP007301 |
| Willis Sewer Service | Ellendale, ND | Dickey | Pumper (Class II) | NDSP007167 |
| Willow Excavating | Willow City, ND | — | Installer | — |
| Witzel Construction LLC | Langdon, ND | — | Installer | — |
| Woodrock, Inc. | Tacoma, WA | — | Installer | — |
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