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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| National Wastewater Systems, Inc. | Lake Charles, LA | — | Installer (Basic)Installer (Combination) | 31116 |
| Nattin Septic Service | Bossier City, LA | — | Installer (Basic)Installer (Combination)Installer (Maintenance) | 32249 |
| ND Sewer LLC | Plaucheville, LA | — | Installer (Basic)Installer (Combination)Installer (Maintenance) | 40123 |
| Nehligs LLC | St. Bernard, LA | — | Installer (Basic)Installer (Combination) | 537 |
| Nola Plumbing & Construction | Baton Rouge, LA | — | Installer (Basic)Installer (Combination) | 32418 |
| Norris & Boudreaux Contractors LLC | Schriever, LA | — | Installer (Basic)Installer (Combination) | 30223 |
| Northshore Septic Systems & Excavation LLC | Ponchatoula, LA | — | Installer (Basic)Installer (Combination) | 30513 |
A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · Z · 0-9