| Company | Location | Certifications | License # |
|---|---|---|---|
| Andrew D. Furbee | Rivesville, WV | Installer (Class I) | 54-20-007 |
| Andrew L Schwartz | Mannington, WV | Installer (Class I) | 54-24-0013 |
| Angela M. Maset | Mannington, WV | Installer (Class I) | 54-22-025 |
| Camron S. Davis | Farmington, WV | Installer (Class II) | 54-20-A-046 |
| Charles R. Morgan Jr. | Fairmont, WV | Installer (Class II) | 54-76-A-0857 |
| Daniel W. Lemley | Fairmont, WV | Installer (Class II) | 54-19-A-026 |
| Dennis Cook | Fairmont, WV | Installer (Class I) | 54-94-0025 |
| Donald Knotts | Fairmont, WV | Installer (Class II) | 54-20-A-036 |
| Edwin Dean Bunner | Fairmont, WV | Installer (Class II) | 54-92-A-0022 |
| Edwin L. Bunner | Fairmont, WV | Installer (Class II) | 54-76-A-0817 |
| Franklin Scott Yedlosky | Fairmont, WV | Installer (Class I) | 54-25-004 |
| Gary W. Blankenship | Fairmont, WV | Installer (Class II) | 54-94-A-0205 |
| James M. Simons | Fairmont, WV | Installer (Class I) | 54-21-053 |
| Jeffrey L. Postlethwait | Fairmont, WV | Installer (Class II) | 54-96-A-0002 |
| Jonathan Moran | Fairmont, WV | Installer (Class I) | 54-25-043 |
| Kadrin Goodman | Fairmont, WV | Installer (Class I) | 54-21-057 |
| Nicholas C. Wilson | Metz, WV | Installer (Class II) | 54-21-A-066 |
| Randal W. Valentine | Rivesville, WV | Installer (Class I) | 54-76-1049 |
| Remigio Leo Petrucci | Farmington, WV | Installer (Class I) | 54-23-061 |
| Richard W. Earle | Fairmont, WV | Installer (Class II) | 54-84-A-0035 |
| Robert D. Gooden Jr. | Monongah, WV | Installer (Class II) | 54-09-A-026 |
| Robert Lee Mcintire | Worthington, WV | Installer (Class II) | 54-78-A-0202 |
| Rodney J. Hatfield | Mannington, WV | Installer (Class I) | 54-96-0034 |
| Sean M. Schimonsky | Fairmont, WV | Installer (Class I) | 54-20-038 |
| Steven L. Morgan | Fairmont, WV | Installer (Class II) | 54-06-A-0082 |
| Steven R. Beatty | Rivesville, WV | Installer (Class II) | 54-06-A-0089 |
| William T. Chickerell | Fairmont, WV | Installer (Class II) | 54-82-A-0009 |
27 companies in the West Virginia OEHS certified onsite sewage system installers are based in Marion County as of 2026-07-23. Companies based elsewhere in West Virginia also commonly serve the county.
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