| Company | Location | Certifications | License # |
|---|---|---|---|
| Bill Joe Gilkerson | Wharncliffe, WV | Installer (Class I) | 54-90-0407 |
| Byron G. Marcum | Delbarton, WV | Installer (Class II) | 54-83-A-0071 |
| Cameron Scott Colegrgrove | Lenore, WV | Installer (Class I) | 54-21-079 |
| Eula JAY LESTER | Gilbert, WV | Installer (Class I) | 54-18-037 |
| George R. White Ii | Delbarton, WV | Installer (Class II) | 54-92-A-0401 |
| John Daivd Smith | Kermit, WV | Installer (Class I) | 54-21-034 |
| Martin Fortner | Gilbert, WV | Installer (Class I) | 54-26-024 |
| Ricky Ferris Jr | Lenore, WV | Installer (Class II) | 54-20-A-033 |
8 companies in the West Virginia OEHS certified onsite sewage system installers are based in Mingo County as of 2026-07-23. Companies based elsewhere in West Virginia also commonly serve the county.
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