| Company | Location | Certifications | License # |
|---|---|---|---|
| Alder Plumbing | O'Neill, NE | InstallerPumper | 412166 |
| Blain Pumping and Plumbing | Page, NE | InstallerPumper | 401674 |
| Central Nebraska Refinishing | Atkinson, NE | Installer | 411002 |
| Doty Plumbing | O'Neill, NE | InstallerPumper | 401986 |
| Kratz Services Inc | O'Neill, NE | Installer | 411371 |
| Loutzenhiser Construction | O'Neill, NE | Installer | 406737 |
| Welsh Well Service | Atkinson, NE | Pumper | 403270 |
7 companies in the Nebraska DEE onsite wastewater (OWT) certified business registry are based in Holt County as of 2026-07-23. Companies based elsewhere in Nebraska also commonly serve the county.
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