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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Wastewater Environmental Systems LLC | Denham Springs, LA | — | Installer (Basic)Installer (Combination) | 31359 |
| Wastewater Treatment Systems & Ops | Denham Springs, LA | — | Installer (Basic)Installer (Combination) | 30129 |
| Wastewater Treatment Systems & Ops | Denham Springs, LA | — | Installer (Basic)Installer (Combination) | 32393 |
| Waters Construction | Coushatta, LA | — | Installer (Basic)Installer (Combination) | 30466 |
| Westin Services | New LLano, LA | — | Installer (Basic)Installer (Combination) | 32157 |
| White Septic Systems LLC | Heflin, LA | — | Installer (Basic)Installer (Combination) | 30218 |
| Wilbert J. Gary & Sons, Inc. | Lafayette, LA | — | Installer (Basic)Installer (Combination) | 749 |
| Wille Management LLC | Ponchatoula, LA | — | Installer (Basic)Installer (Combination) | 40060 |
| Wille Services | Plaquemine, LA | — | Installer (Basic)Installer (Combination) | 32087 |
| Wingate Construction | Rayne, LA | — | Installer (Basic)Installer (Combination) | 31590 |
| WNK Plumbing Co. inc. | Winnsboro, LA | — | Installer (Basic)Installer (Combination) | 32375 |
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