| Company | Location | Certifications | License # |
|---|---|---|---|
| 828 Excavation & Stump Grinding | Marion, NC | Installer (Level II) | 11757 |
| A & M Grading And Septic | Old Fort, NC | Installer (Level IV) | 4730 |
| All Terrain Construction | Marion, NC | Installer (Level II) | 12004 |
| B B & B Grading Llc | Marion, NC | Installer (Level II) | 9964 |
| Beam'S Construction | Old Fort, NC | Installer (Level IV)Inspector | 3902 |
| Billy Sigmon Septic Tank & Grading | Old Fort, NC | Installer (Level IV) | 1760 |
| Bobby Honeycutt Contracting Llc | Nebo, NC | Installer (Level II) | 14367 |
| Brewer Landscaping & Clearing | Old Fort, NC | Installer (Level II) | 9541 |
| Bumgarner Grading | Nebo, NC | Installer (Level IV) | 1829 |
| Burgin & Son Septic Services | Marion, NC | Installer (Level IV)Inspector | 1832 |
| Cable Septic And Backhoe Service | Marion, NC | Installer (Level IV) | 2689 |
| Carolina Ditching & Demo | Marion, NC | Installer (Level II) | 9849 |
| Carolina Site Worx Llc | Marion, NC | Installer (Level II) | 11820 |
| Catawba Hardwords | Marion, NC | Installer (Level IV) | 3939 |
| Chapman Hauling Llc | Marion, NC | Installer (Level II) | 15222 |
| Complete Landscaping | Marion, NC | Installer (Level II) | 15408 |
| Crw Land Services Llc | Old Fort, NC | Installer (Level II) | 7206 |
| Dan Vallini | Nebo, NC | Installer (Level II) | 12046 |
| David Benfield | Morganton, NC | Installer (Level IV) | 13038 |
| Digg Rite Llc | Morganton, NC | Installer (Level II) | 14089 |
| Diggin Deeper Grading & Excavation Llc | Marion, NC | Installer (Level II) | 12089 |
| Douglas Lee Cooksey | Marion, NC | Installer (Level II) | 11683 |
| East Coast Grading And Land Management | Marion, NC | Installer (Level II) | 9198 |
| Elliott Clearing & Septic | Marion, NC | Installer (Level II) | 2966 |
| English Trucking And Grading Llc | Marion, NC | Installer (Level II) | 4611 |
| Eps Septic And Grading | Marion, NC | Installer (Level II) | 9529 |
| Farmer Construction | Old Fort, NC | Installer (Level II) | 8099 |
| Father And Son Enterprises Llc | Marion, NC | Installer (Level IV)Inspector | 6168 |
| Fkluorytdi'Ss Septic And Grading | Nebo, NC | Installer (Level II) | 9982 |
| Gehman'S Concrete Llc | Marion, NC | Installer (Level II) | 14042 |
| Graylan Concrete Works | Marion, NC | Installer (Level II) | 2798 |
| Grindstaff & Son Grading | Marion, NC | Installer (Level II) | 6597 |
| H & F Property Management Llc | Marion, NC | Installer (Level II) | 9182 |
| H H & E Llc | Marion, NC | Installer (Level II) | 9466 |
| Home Maintenance And Repair | Marion, NC | Installer (Level II)Inspector | 6646 |
| James Gouge | Marion, NC | Installer (Level II) | 11822 |
| Jc Property Professionals | Marion, NC | Installer (Level II) | 6819 |
| Jeff Banks And Son Clearing & Grading | Marion, NC | Installer (Level II) | 4615 |
| Joe Boitnotte | Boone, NC | Installer (Level IV)Inspector | 3779 |
| Justin Watson | Marion, NC | Installer (Level II) | 15200 |
| Kristie D Gross | Marion, NC | Installer (Level II) | 9867 |
| Kyle Mcclure | Marion, NC | Installer (Level II) | 9554 |
| Long Branch Farms And Trackhoe Services | Nebo, NC | Installer (Level II) | 14678 |
| Lunsford Grading & Septic Systems Inc | Nebo, NC | Installer (Level IV) | 3793 |
| M & M Forestry Ent Llc | Nebo, NC | Installer (Level II) | 11264 |
| Maple Ridge Grading & Septic | Old Fort, NC | Installer (Level II) | 11035 |
| Mcdowell Building Llc | Marion, NC | Installer (Level II)Inspector | 8062 |
| Mcdowell Building Llc | Marion, NC | Installer (Level IV) | 8063 |
| Millers Grading & Trucking | Old Fort, NC | Installer (Level II) | 3670 |
| Mountaineer Pumping | Marion, NC | Installer (Level II) | 15319 |
| Nathan White | Marion, NC | Installer (Level IV) | 11328 |
| Nathan Worley | Marion, NC | Installer (Level II) | 14134 |
| Ned Sewell | Marion, NC | Installer (Level II) | 15403 |
| North Fork Grading & Design | Marion, NC | Installer (Level II) | 5219 |
| Padgett Septic & Grading | Marion, NC | Installer (Level II) | 4600 |
| Parker Construction & Septic | Marion, NC | Installer (Level II) | 9366 |
| Pittman Plumbing | Old Fort, NC | Installer (Level II) | 15381 |
| Ready Septic Llc | Lenoir, NC | Installer (Level II) | 9826 |
| Roland Septic & Grading | Marion, NC | Installer (Level IV)Inspector | 6113 |
| Sanders Design Landscaping Llc | Marion, NC | Installer (Level II) | 9967 |
| Sean Walden | Old Fort, NC | Installer (Level II) | 9975 |
| Stephen Proctor | Marion, NC | Installer (Level II) | 15170 |
| Steve Hitt Trucking & Grading | Nebo, NC | Installer (Level II) | 14057 |
| Suttle Septic Solutions | Nebo, NC | Installer (Level II) | 14749 |
| Suttles Trucking & Grading Inc | Nebo, NC | Installer (Level IV) | 1876 |
| Suttles Trucking & Grading Inc | Nebo, NC | Installer (Level IV) | 1875 |
| Sweaty'S Lawn Care | Old Fort, NC | Installer (Level II) | 11127 |
| T G Construction | Nebo, NC | Installer (Level II) | 3041 |
| T G Construction | Nebo, NC | Installer (Level IV)Inspector | 3042 |
| Woods Septic And Grading | Marion, NC | Installer (Level II) | 11389 |
| Wqt Llc | Nebo, NC | Installer (Level II) | 6728 |
71 companies in the NCOWCICB certified onsite wastewater contractor & inspector lists are based in Mcdowell County as of 2026-07-23. Companies based elsewhere in North Carolina also commonly serve the county.
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