| Company | Location | Certifications | License # |
|---|---|---|---|
| G & S Pumping LLC | Fairbury, NE | Pumper | 410554 |
| Milius Hardware Inc | Plymouth, NE | Installer | 402749 |
| Petersen Plumbing & Heating | Fairbury, NE | Installer | 402997 |
| Pollman LLC | Fairbury, NE | Installer | 410816 |
4 companies in the Nebraska DEE onsite wastewater (OWT) certified business registry are based in Jefferson County as of 2026-07-23. Companies based elsewhere in Nebraska also commonly serve the county.
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