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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| D & B Portables | Sanborn, ND | Barnes | Pumper (Class I) | NDSP007388 |
| D&D Water Well Service, Inc. | Watford City, ND | — | Installer | — |
| D&L Construction, Inc. | Parshall, ND | — | Installer | — |
| Dak Construction, Llc | Pick City, ND | — | Installer | — |
| Dakota Asphalt & Excavation | Fordville, ND | — | Installer | — |
| Dakota Dirt and Drain | Bismarck, ND | — | Installer | — |
| Dakota Drain Fields, Llp | Mandan, ND | — | Installer | — |
| Dakota Earthworks LLC | Washburn, ND | — | Installer | — |
| Dakota Improvement | Oakes, ND | — | Installer | — |
| Dakota Septic Service | Rutland, ND | Sargent | Pumper (Class I) | NDSP007298 |
| Dakota Underground Specialities | Minot, ND | — | Installer | — |
| Dale Pottorff | Dickinson, ND | — | Installer | — |
| DB Plumbing and Service | Mandan, ND | — | Installer | — |
| DBA Steen Construction Davidson Construction Inc | Minot, ND | — | Installer | — |
| Dean Oakland | Cartwright, ND | — | Installer | — |
| Dean's Excavating | Minot, ND | — | Installer | — |
| Dehne Septic Pumping Service | Cleveland, ND | — | Installer | — |
| Dehne Septic Pumping Service | Cleveland, ND | Stutsman | Pumper (Class II) | NDSP07399 |
| Delta Constructors | Watford City, ND | — | Installer | — |
| Deuces Wild Septic Service | Bismarck, ND | Morton | Pumper (Class I) | NDSP007313 |
| Deuces Wild Septic Service, LLC | Bismarck, ND | — | Installer | — |
| Dewald Backhoe Inc | Jamestown, ND | — | Installer | — |
| Dick's Sewer Service | Valley City, ND | Barnes | Pumper (Class I) | NDSP007371 |
| Dickinson Sanitation LLC | Dickinson, ND | Stark | Pumper (Class II) | NDSP007308 |
| Dig It Up Backhoe Service | Minot, ND | — | Installer | — |
| Diggity Doug's Construction Inc | Sawyer, ND | — | Installer | — |
| Dirt Dynamics | Fargo, ND | — | Installer | — |
| Dirt Dynamics, LLC | Fargo, ND | Cass | Pumper (Class I) | NDSP007257 |
| Dirt Pro Services & Septic, Llc | Beulah, ND | — | Installer | — |
| Dirtworx Excavating, LLC | Fargo, ND | — | Installer | — |
| Dirty Deeds Excavating | Washburn, ND | — | Installer | — |
| DKL Management | Minot, ND | — | Installer | — |
| Doorbust'n Portables & Septic Service | Sidney, MT | Richland | Pumper (Class I) | NDSP007311 |
| Drain Man Inc | Underwood, ND | — | Installer | — |
| Dub Construction | Manvel, ND | — | Installer | — |
| Dueling Dakota Septic | Bowman, ND | Bowman | Pumper (Class II) | NDSP007386 |
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