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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| M & M Contractors, LLC | Breckenridge, MN | — | Installer | — |
| M & S Septic Service | Wilton, ND | Burleigh | Pumper (Class II) | NDSP007318 |
| M/T Contracting LLC | Flasher, ND | — | Installer | — |
| M&K Portapotties | Grand Forks, ND | Grand Forks | Pumper (Class I) | NDSP007320 |
| M4 Contracting LLC | Park River, ND | — | Installer | — |
| Maddock Construction | Maddock, ND | — | Installer | — |
| Magrum Excavating & | Hazelton, ND | — | Installer | — |
| Magrum Excavating & Plumbing Co. | Hazelton, ND | Emmons | Pumper (Class II) | NDSP007395 |
| Maple River Colony | Fullerton, ND | — | Installer | — |
| Maple River Colony | Fullerton, ND | Dickey | Pumper (Class II) | NDSP007391 |
| Mighty Rentals | Halliday, ND | Dunn | Pumper (Class I) | NDSP07405 |
| Mike Austfjord & Sons Inc | Cavalier, ND | — | Installer | — |
| Mikkelsen Aggregates LLC | Bottineau, ND | — | Installer | — |
| Mikkelsen Bros. Construction Co. | Langdon, ND | — | Installer | — |
| Mittleider Execavating & Horizontal Boring | Tappen, ND | — | Installer | — |
| Mock Excavating & Concrete | Minot, ND | — | Installer | — |
| Moen Portable Toilets & Septic Pumping | Fargo, ND | Cass | Pumper (Class I) | NDSP07408 |
| MonDak Portables LLC | Williston, ND | Williams | Pumper (Class I) | NDSP007303 |
| Moore's Septic Pumping LLC | Detroit Lakes, MN | — | Pumper (Class I) | NDSP07401 |
| Moritz Excavating | Valley City, ND | — | Installer | — |
| Mountrail Builders, Inc. | Stanley, ND | — | Installer | — |
| MT Septic Service | Barney, ND | Richland | Pumper (Class I) | NDSP007309 |
| Mul T Services & Contracting | Stanton, ND | Mercer | Pumper (Class II) | NDSP007357 |
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