| Company | Location | Certifications | License # |
|---|---|---|---|
| Carroll Scott Parrish | Cox's Mills, WV | Installer (Class II) | 54-18-A-036 |
| Daniel Moore | Normantown, WV | Installer (Class I) | 54-23-031 |
| DANIEL R. McKEE | Glenville, WV | Installer (Class I) | 54-21-063 |
| Freddie D. Hall | Glenville, WV | Installer (Class I) | 54-21-026 |
| Jerry (j.d.) Duelley Ii | Glenville, WV | Installer (Class I) | 54-22-001 |
| Patrick Frymier | Cox Mills, WV | Installer (Class II) | 54-24-A-0025 |
6 companies in the West Virginia OEHS certified onsite sewage system installers are based in Gilmer County as of 2026-07-23. Companies based elsewhere in West Virginia also commonly serve the county.
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