| Company | Location | Certifications | License # |
|---|---|---|---|
| Clyde Rainbolt | Watauga, NC | Installer (Level II) | 15173 |
| Dillard Outdoor Designs | Ducktown, NC | Installer (Level II) | 5273 |
| Grassy Creek Construction | Johnson City, NC | Installer (Level II) | 7379 |
| Km Consulting And Development Llc | Trade, NC | Installer (Level II) | 15362 |
| Mahala Electric & Excavation | Mountain City, NC | Installer (Level II) | 15032 |
| Mike Cable | Roan Mountain, NC | Installer (Level II) | 11179 |
| Onsite Construction Inc | Elizabethton, NC | Installer (Level IV)Inspector | 5800 |
| Premier Excavation & Construction | Greenville, NC | Installer (Level II) | 9007 |
| Rgc Septic | Jonesborough, NC | Installer (Level IV) | 11107 |
| Ryan Mahala | Trade, NC | Installer (Level II) | 15141 |
| Thomas Arnold | Surgoinsville, NC | Installer (Level II) | 15084 |
| V & V Land Management And Resource | Del Rio, NC | Installer (Level II) | 9590 |
| Ye Ol Septic Company Llc | Surgoinsville, NC | Installer (Level II) | 11648 |
13 companies in the NCOWCICB certified onsite wastewater contractor & inspector lists are based in Tenn County as of 2026-07-23. Companies based elsewhere in North Carolina also commonly serve the county.
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