| Company | Location | Certifications | License # |
|---|---|---|---|
| Brady Kitzmiller | Bayard, WV | Installer (Class II) | 54-19-A-015 |
| Bryon Alan Goldizen | Cabins, WV | Installer (Class I) | 54-25-056 |
| Chris Whetzel | Petersburg, WV | Installer (Class I) | 54-08-0036 |
| Darren D. Alt | Petersburg, WV | Installer (Class I) | 54-00-0215 |
| David M Nauta | Maysville, WV | Installer (Class II) | 54-26-A-007 |
| Fred I. Roby | Petersburg, WV | Installer (Class I) | 54-23-003 |
| Frederick A. Hinkle | Petersburg, WV | Installer (Class II) | 54-91-A-0229 |
| Gerald R. Sites | Petersburg, WV | Installer (Class I) | 54-76-1186 |
| James Edward Reed | Mount Storm, WV | Installer (Class I) | 54-99-0211 |
| Jeremy Dibenedetto | Petersburg, WV | Installer (Class I) | 54-99-0224 |
| Jonathan R. Kuhn | Petersburg, WV | Installer (Class I) | 54-21-067 |
| Joshua M. Funk | Maysville, WV | Installer (Class I) | 54-23-028 |
| Larry T. Scott | Petersburg, WV | Installer (Class II) | 54-95-A-0227 |
| Mark C. Geary | Petersburg, WV | Installer (Class II) | 54-08-A-0013 |
| Mark K. Sturgill | Petersburg, WV | Installer (Class I) | 54-20-029 |
| Randal D. Mongold | Petersburg, WV | Installer (Class II) | 54-87-A-0226 |
| Robert T Iser Jr. | Maysville, WV | Installer (Class I) | 54-25-049 |
| Rodger L. Uphold | Mount Storm, WV | Installer (Class I) | 54-92-0201 |
| Timmy D. Dayton | Maysville, WV | Installer (Class II) | 54-85-A-0103 |
19 companies in the West Virginia OEHS certified onsite sewage system installers are based in Grant County as of 2026-07-23. Companies based elsewhere in West Virginia also commonly serve the county.
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