| Company | Location | Certifications | License # |
|---|---|---|---|
| Byron Randall | — | Installer | — |
| Chuck Glass | — | Installer | — |
| Fredrick Aldridge | — | Installer | — |
| Hunter Colyar | — | Installer | — |
| Jerry Gaddy | — | InstallerPumper | — |
5 companies in the Alabama Onsite Wastewater Board licensee roster are based in Marengo County as of 2026-07-23. Companies based elsewhere in Alabama also commonly serve the county.
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