| Company | Location | Certifications | License # |
|---|---|---|---|
| Allpro Plumbing | Douglas, NE | Installer | 403257 |
| Barrett Construction Co | Nebraska City, NE | Installer | 401651 |
| Mueller Trenching Inc | Syracuse, NE | Installer | 402908 |
3 companies in the Nebraska DEE onsite wastewater (OWT) certified business registry are based in Otoe County as of 2026-07-23. Companies based elsewhere in Nebraska also commonly serve the county.
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