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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| K & H Electric, Inc. | Linton, ND | — | Installer | — |
| K&L Backhoe Service | Killdeer, ND | — | Installer | — |
| Kaelberer Construction, Inc. | Mandan, ND | — | Installer | — |
| KDW Construction | Williston, ND | — | Installer | — |
| Keith Biggers Sewer Services | Buffalo, ND | Cass | Pumper (Class II) | NDSP007393 |
| Kelsey's Bobcat & Backhoe Service | Surrey, ND | — | Installer | — |
| Kemper Construction Company | Minot, ND | — | Installer | — |
| Kent's Plumbing and Heating LLC | Williston, ND | — | Installer | — |
| Kepida Contracting | Jamestown, ND | — | Installer | — |
| Kerry Lemer | Moffit, ND | — | Installer | — |
| Kilen Backhoe Svc, LLC | Fairview, MT | — | Installer | — |
| Kilichowski Trucking Inc. | Forest River, ND | — | Installer | — |
| Killdeer Mountain Contracting | Killdeer, ND | — | Installer | — |
| Kilmer Excavating | Grafton, ND | — | Installer | — |
| Kim's Septic Service | New Rockford, ND | Eddy | Pumper (Class I) | NDSP007336 |
| Kimball Construction, Inc. | Watford City, ND | — | Installer | — |
| Kioti Contracting, Llc | Mandan, ND | — | Installer | — |
| Kirkland, Inc | Watford City, ND | — | Installer | — |
| Kitzan Septic Service LLC | Glen Ullin, ND | Grant | Pumper (Class I) | NDSP007325 |
| KJ Excavating | Rolette, ND | — | Installer | — |
| KJ Excavating & HTG | Rolette, ND | Rolette | Pumper (Class I) | NDSP007381 |
| Kjelland Excavation | Valley City, ND | — | Installer | — |
| Klesalek Excavating | Mandan, ND | — | Installer | — |
| Knudson Septic Pumping LLC | Larimore, ND | Grand Forks | Pumper (Class II) | NDSP07407 |
| Knudson Septic Pumping, LLC | Larimore, ND | — | Installer | — |
| Kolden Septic Tank Service | Roseglen, ND | McLean | Pumper (Class II) | NDSP007304 |
| Kollman Construction | Hazen, ND | — | Installer | — |
| KP Excavating | Penn, ND | — | Installer | — |
| Krebsbach Backhoe | Jamestown, ND | — | Installer | — |
| Krema Designs | Minot, ND | — | Installer | — |
| Kringstad Drain Cleaning | Grafton, ND | — | Installer | — |
| Kringstad Septic Tank Service | Grafton, ND | Walsh | Pumper (Class I) | NDSP007382 |
| Kummer's Pumping Inc | Watford City, ND | — | Installer | — |
| Kummers Pumping, Inc. | Watford City, ND | McKenzie | Pumper (Class II) | NDSP007316 |
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