| Company | Location | Certifications | License # |
|---|---|---|---|
| Mersserlie Brothers Constructi | South Sioux City, NE | Pumper | 433126 |
| Siouxland Well Company Inc | Dakota City, NE | InspectorInstaller | 403228 |
2 companies in the Nebraska DEE onsite wastewater (OWT) certified business registry are based in Dakota County as of 2026-07-23. Companies based elsewhere in Nebraska also commonly serve the county.
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