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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| A & C Land Development Inc | Washburn, ND | — | Installer | — |
| A-1 Evans Septic Service | Minot, ND | — | Installer | — |
| A-1 Evans Septic Tank Service | Minot, ND | Ward | Pumper (Class I) | NDSP007330 |
| A-1 Sanitation & Excavation | Dickinson, ND | Stark | Pumper (Class II) | NDSP007322 |
| A-1 Septic Pumping Plus | Mandan, ND | Burleigh | Pumper (Class II) | NDSP007347 |
| A.S.A.P. Pumping Service | Gladstone, ND | Dunn | Pumper (Class II) | NDSP007380 |
| A&A Sanitation, LLC | Killdeer, ND | Dunn | Pumper (Class I) | NDSP007312 |
| A&M Quality Building & Remodeling, LLC | Williston, ND | — | Installer | — |
| A1 Contractors | Dickinson, ND | — | Installer | — |
| Abe's Excavating | Devils Lake, ND | — | Installer | — |
| Above the Level Plumbing LLC | Williston, ND | — | Installer | — |
| Adam Thacker | Neche, ND | — | Installer | — |
| Advanced Construction & Design | Washington, UT | — | Installer | — |
| Advanced Custom Contractors | Dickinson, ND | — | Installer | — |
| Advanced Services, Inc. | Saginaw, MN | — | Pumper (Class I) | NDSP007329 |
| Advent Plumbing | Williston, ND | — | Installer | — |
| Agri Industries, Inc. | Williston, ND | — | Installer | — |
| Air Flow | Horace, ND | Cass | Pumper (Class II) | NDSP007287 |
| Alan Helm Contracting | McClusky, ND | — | Installer | — |
| All Source Plumbing | Williston, ND | — | Installer | — |
| Allen Fenstermacker Construction | Stanley, ND | — | Installer | — |
| Alpha Septic and Sewer Inc | Williston, ND | — | Installer | — |
| Alpine Breeze LLC | Horace, ND | Cass | Pumper (Class II) | NDSP007373 |
| AM Construction | Plaza, ND | — | Installer | — |
| Anderson & Wood Construction | Meridian, ID | — | Installer | — |
| Andy's Excavating | Leonard, ND | — | Installer | — |
| ARK Enterprises | Watford City, ND | — | Installer | — |
| Asplin Excavating | Fargo, ND | Cass | Pumper (Class I) | NDSP007324 |
| Atlas Excavating LLC | Bismarck, ND | — | Installer | — |
| Aurora Plumbing Elec. & HVAC | Hankinson, ND | — | Installer | — |
| AW Excavating | Wishek, ND | — | Installer | — |
| Azure's Excavating | Rolla, ND | — | Installer | — |
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