| Company | Location | Certifications | License # |
|---|---|---|---|
| Brogden Contractor Services | Mt Olive, NC | Installer (Level II) | 11752 |
| Cypress Siteworks Inc | Beulaville, NC | Installer (Level IV) | 11021 |
| Czls Skyscraper Waterproofing | Albertson, NC | Installer (Level II) | 11497 |
| Danny K Best Jr | Warsaw, NC | Installer (Level IV)Inspector | 5549 |
| Dobson Septic Tank | Magnolia, NC | Installer (Level IV) | 1980 |
| Dobson'S Septic Tank | Magnolia, NC | Installer (Level IV) | 1979 |
| East Duplin Precast Llc | Beulaville, NC | Installer (Level IV) | 11953 |
| Enc Septic Services | Beaulaville, NC | Installer (Level IV) | 11690 |
| Flowtech Septic Solutions | Warsaw, NC | Installer (Level IV) | 11387 |
| Gainus Lawn Maintenance | Beulaville, NC | Installer (Level IV) | 11864 |
| Hall'S Services Llc | Rose Hill, NC | Installer (Level II) | 15318 |
| Janie Wargo | Chinaquapin, NC | Installer (Level IV)Inspector | 11955 |
| Jeffrey Stewart Grady | Warsaw, NC | Installer (Level II) | 15312 |
| Joshua Fulton | Wallace, NC | Installer (Level II) | 14354 |
| Kelvin Ramirez | Warsaw, NC | Installer (Level II) | 15044 |
| M & C Septic Tank Service Inc | Beulaville, NC | Installer (Level IV)Inspector | 1214 |
| M P H Driveways & Septic Tanks Inc | Mount Olive, NC | Inspector | 13059I |
| Mathis Masonry | Warsaw, NC | Installer (Level II) | 6813 |
| Mathis Masonry | Warsaw, NC | Installer (Level II) | 6812 |
| Michael Blackburn | Wallace, NC | Installer (Level II) | 5151 |
| Mobile Service Of Beulaville | Pink Hill, NC | Installer (Level IV) | 3011 |
| Mph Driveways & Septic Tanks Inc | Mount Olive, NC | Installer (Level IV)Inspector | 4992 |
| Ramfam Builders Llc | Calypso, NC | Installer (Level II) | 11026 |
| Riverside Septic Llc | Wallace, NC | Installer (Level II) | 7234 |
| Soil & Water Consulting Pllc | Kenansville, NC | Designer (Soil Evaluator) | 10049E |
| Trevor Wargo | Chinquapin, NC | Installer (Level IV) | 11956 |
| Whaley Onsite | Chinquapin, NC | Installer (Level IV) | 2010 |
| Whaley Onsite Llc | Chinquapin, NC | Installer (Level IV) | 6649 |
| Y And G Septics | Mount Olive, NC | Installer (Level II) | 9853 |
29 companies in the NCOWCICB certified onsite wastewater contractor & inspector lists are based in Duplin County as of 2026-07-23. Companies based elsewhere in North Carolina also commonly serve the county.
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