| Company | Location | Certifications | License # |
|---|---|---|---|
| Billy Kirkland | — | Installer | — |
| Brad Payne | — | Pumper | — |
| Brandon Stubblefield | — | Installer | — |
| Chris Christian | — | InstallerPumper | — |
| Cooper Lively | — | Installer | — |
| Corey Motes | — | Installer | — |
| Daniel Johnson | — | Installer | — |
| David Piper | — | Installer | — |
| Dennis Pence | — | Installer | — |
| Douglas Harper | — | Installer | — |
| James Rankin | — | InstallerPumper | — |
| James Todd | — | Installer | — |
| Jeffrey Word | — | Pumper | — |
| Jeremy Johnson | — | Installer | — |
| Jesse Kilgo | — | Installer | — |
| Jim King | — | Installer | — |
| John Cooper Iii | — | Installer | — |
| Johnny Bright | — | Installer | — |
| Lex Wooten | — | Installer | — |
| Marty Tidmore | — | InstallerPumper | — |
| Pamela Tidmore | — | InstallerPumper | — |
| Peter Lennihan | — | Pumper | — |
| Randall Anderson | — | InstallerPumper | — |
| Randie Walker | — | Installer | — |
| Russell Rahn | — | Installer | — |
| Sherman Hill Ii | — | Installer | — |
| Steve Bright | — | Installer | — |
| Steven Watwood | — | Installer | — |
| Thomas Webb | — | Pumper | — |
| Tristan Wallace | — | InstallerPumper | — |
30 companies in the Alabama Onsite Wastewater Board licensee roster are based in Marshall County as of 2026-07-23. Companies based elsewhere in Alabama also commonly serve the county.
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