| Company | Location | Certifications | License # |
|---|---|---|---|
| BERT McCLELLAN GRIMM III | Point Pleasant, WV | Installer (Class II) | 54-06-A-0064 |
| George C. Sommer II | Southside, WV | Installer (Class II) | 54-24-A-0026 |
| Guy N Sayre JR. | Point Pleasant, WV | Installer (Class II) | 54-26-A-018 |
| Harry James Butler | Henderson, WV | Installer (Class II) | 54-97-A-0805 |
| Jason Johnson | Leon, WV | Installer (Class II) | 54-17-A-022 |
| Jonathan Higginibotham | Leon, WV | Installer (Class II) | 54-23-A-051 |
| Joseph Wilson Cupp | Milton, WV | Installer (Class I) | 54-22-027 |
| Joshua Allen Searls | Southside, WV | Installer (Class II) | 54-20-A-043 |
| Kenneth Ray Jones Ii | Point Pleasant, WV | Installer (Class II) | 54-00-A-0813 |
| Paul David Rollins | Pt. Pleasant, WV | Installer (Class II) | 54-03-A-0054 |
| Russell Watterson | Apple Grove, WV | Installer (Class I) | 54-10-003 |
| Ryan Scott Gibson | Point Pleasant, WV | Installer (Class I) | 54-25-059 |
| Vermont F. Higginbotham | Leon, WV | Installer (Class II) | 54-19-A-014 |
| William C. Buffington | Leon, WV | Installer (Class I) | 54-24-0055 |
14 companies in the West Virginia OEHS certified onsite sewage system installers are based in Mason County as of 2026-07-23. Companies based elsewhere in West Virginia also commonly serve the county.
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