| Company | Location | Certifications | License # |
|---|---|---|---|
| A2Z Plumbing | Grand Island, NE | Installer | 432231 |
| Herman Plumbing Company Inc | Grand Island, NE | InstallerPumper | 401987 |
| Klingers Plumbing & Heating | Wood River, NE | Installer | 402770 |
| Larry's Plumbing Company Inc | Grand Island, NE | Installer | 401844 |
| Manfull Plumbing Plus LLC | Grand Island, NE | Installer | 402836 |
| Mike's Backhoe | Grand Island, NE | InspectorInstallerPumper | 410868 |
| O'Hara Plumbing Co Inc | Grand Island, NE | Installer | 407348 |
| Sewer Rooter & Plumbing | Grand Island, NE | InstallerPumper | 431937 |
| Shaw Enterprises | Grand Island, NE | Installer | 411827 |
9 companies in the Nebraska DEE onsite wastewater (OWT) certified business registry are based in Hall County as of 2026-07-23. Companies based elsewhere in Nebraska also commonly serve the county.
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