| Company | Location | Certifications | License # |
|---|---|---|---|
| Andrew Adcock Iv | — | Installer | — |
| Bradley Johnson | — | Installer | — |
| Christopher Franks | — | Installer | — |
| Foy Green | — | Installer | — |
| Jerrmie Green | — | InstallerPumper | — |
| Jerry Buckner | — | InstallerPumper | — |
| Mark Nichols | — | Installer | — |
| Matthew Green | — | InstallerPumper | — |
| Phillip Ballard | — | Installer | — |
| Roger Baggett | — | InstallerPumper | — |
| Ronnie Green | — | Installer | — |
| Timothy Brannon | — | Installer | — |
12 companies in the Alabama Onsite Wastewater Board licensee roster are based in Marion County as of 2026-07-23. Companies based elsewhere in Alabama also commonly serve the county.
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