| Company | Location | Certifications | License # |
|---|---|---|---|
| A & R Enterprises Of Harnett County Llc | Angier, NC | Installer (Level IV) | 6130 |
| Adams Soil Consulting Pllc | Angier, NC | Designer (Soil Evaluator) | 10021E |
| Allegiance Plumbing Llc | Angier, NC | Installer (Level II) | 15292 |
| B & L Construction & Septic Service | Coats, NC | Installer (Level II) | 6851 |
| B & L Construction & Septic Service Llc | Coats, NC | Installer (Level IV)Inspector | 7242 |
| Barefoot Building Company | Angier, NC | Installer (Level II) | 14165 |
| Bmg Site Solutions | Cameron, NC | Installer (Level II) | 14168 |
| Browns Backhoe & Septic Tank Services Ll | Lillington, NC | Installer (Level II) | 11159 |
| Cardenas Construction | Angier, NC | Installer (Level II) | 2455 |
| Christopher Sutton | Dunn, NC | Installer (Level II) | 15419 |
| Clint Adams Hauling & Grading Llc | Angier, NC | Installer (Level IV)Inspector | 1205 |
| Clint Adams Hauling And Grading | Angier, NC | Installer (Level II) | 14961 |
| Cooper Plumbing & Septic Service | Dunn, NC | Installer (Level II) | 4453 |
| David Hillman Price | Fuquay Varina, NC | Installer (Level II) | 15252 |
| David Jones Home Services | Erwin, NC | Inspector | 6567I |
| Eastern Septic & Inspections | Erwin, NC | Installer (Level IV)Inspector | 5572 |
| Elvis Faircloth Grading Inc | Broadway, NC | Installer (Level IV) | 2704 |
| Gerald Temple Backhoe Service Llc | Bunnlevel, NC | Installer (Level IV)Inspector | 5172 |
| Gerald Temple Backhoe Services Llc | Bunnlevel, NC | Installer (Level IV)Inspector | 1178 |
| Goose Grading | Lillington, NC | Installer (Level II) | 11532 |
| Grade A Septic Inspectors | Dunn, NC | Installer (Level II)Inspector | 5843 |
| Grade A Septic Inspectors (Gasi) | Dunn, NC | Installer (Level II) | 6141 |
| Greener Ehs Solutions Llc | Holly Springs, NC | Installer (Level IV) | 11419 |
| Griffin Site & Septic Llc | Broadway, NC | Installer (Level II) | 15113 |
| Gut Busters Septic Tank Service Llc | Linden, NC | Inspector | 13061I |
| Hal Owen & Associates | Lillington, NC | Inspector | 9943I |
| Hal Owen & Associates Inc | Lillington, NC | Designer (Soil Evaluator) | 10036E |
| Harpo'S Llc | Cameron, NC | Installer (Level IV) | 9482 |
| Holland Septic Services | Lillington, NC | Installer (Level IV)Inspector | 6901 |
| James Edward Manhart Iii | Coats, NC | Installer (Level IV)Inspector | 5195 |
| Jason Jason Construction Llc | Angier, NC | Installer (Level IV) | 9396 |
| K D Grading Llc | Fuquay Varina, NC | Installer (Level II) | 6131 |
| Ktb Utilities Inc | Fuquay Varina, NC | Installer (Level II) | 15436 |
| Ktb Utilities Inc | Fuquay Varina, NC | Installer (Level II) | 15470 |
| Larry Sharpe Septic Tank Co | Sanford, NC | Installer (Level II) | 1165 |
| Lonnie Johnson Backhoe Llc | Broadway, NC | Installer (Level IV) | 2723 |
| Massa And Sons Llc | Sanford, NC | Installer (Level II) | 15143 |
| Matthew Hart | Broadway, NC | Installer (Level II) | 14624 |
| Matthews Backhoe Service | Kipling, NC | Installer (Level IV) | 1228 |
| Moores Dirt Work And Septic Llc | Sanford, NC | Installer (Level II) | 15243 |
| Nublue Plumbing | Fayetteville, NC | Installer (Level II) | 14210 |
| Piedmont Septic Pumping 1 Llc | Lillington, NC | Inspector | 7077I |
| Pine State Construction Group Llc | Willow Spring, NC | Installer (Level II) | 14739 |
| Precision Septic | Angier, NC | Installer (Level IV)Inspector | 1098 |
| Rays Mechanical Llc | Lillington, NC | Installer (Level II) | 15483 |
| Richard Martin | Broadway, NC | Installer (Level II) | 15071 |
| S & S Specialist | Bunnlevel, NC | Installer (Level II) | 9029 |
| S G Finch Contracting | Angier, NC | Installer (Level II) | 14817 |
| Scott Kevin Larkey | Lillington, NC | Installer (Level II) | 9968 |
| Stancil Builders Inc | Angier, NC | Installer (Level IV)Inspector | 2761 |
| Stewart Septic And Excavation | Dunn, NC | Installer (Level II)Inspector | 15057 |
| T2 Contracting Inc | Fuquay Varina, NC | Installer (Level IV) | 9214 |
| Ted Brown | Cameron, NC | Installer (Level IV) | 1041 |
| Thomas Plumbing & Septic | Boradway, NC | Installer (Level II) | 15062 |
| Tommy Coley Backhoe Ser | Fuquay Varina, NC | Installer (Level II) | 1937 |
| Trico Exteriors Llc | Dunn, NC | Installer (Level II) | 15117 |
| Wall Excavation | Fuquay-Varina, NC | Installer (Level IV) | 1290 |
| Wesley Clayton Hamilton Jr | Dunn, NC | Installer (Level IV) | 11869 |
| William Moore | Fuquay Varina, NC | Installer (Level II) | 11088 |
| Yellow Dog Grading & Landscaping Llc | Lillington, NC | Installer (Level II) | 4621 |
| Zachary Justin Seibert | Lillington, NC | Installer (Level II) | 11031 |
61 companies in the NCOWCICB certified onsite wastewater contractor & inspector lists are based in Harnett County as of 2026-07-23. Companies based elsewhere in North Carolina also commonly serve the county.
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