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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| B & B Repair | Glen Ullin, ND | — | Installer | — |
| B & C Sanitation Services LLC | Dickinson, ND | Stark | Pumper (Class I) | NDSP007296 |
| B & E Excavating & Homes LLC | Enderlin, ND | — | Installer | — |
| B & E Excavating and Homes | Enderlin, ND | — | Installer | — |
| B & J Excavating | Rugby, ND | — | Installer | — |
| B&B Contracting | Aberdeen, SD | — | Installer | — |
| Baranko Companies | Dickinson, ND | — | Installer | — |
| Barrett Excavating, Inc. | Mandan, ND | — | Installer | — |
| Barry's Excavating Construction | Minot, ND | — | Installer | — |
| Basaraba Excavating & Dirt Works LLC | Wilton, ND | — | Installer | — |
| Bayview South LLC | Devils Lake, ND | — | Installer | — |
| Bear Mountain LLC | New Town, ND | — | Installer | — |
| Beckman Septic LLC | Valley City, ND | Barnes | Pumper (Class II) | NDSP007290 |
| Beeter Brothers Construction LLC | Minot, ND | — | Installer | — |
| Bek Consulting | Dickinson, ND | — | Installer | — |
| Ben Hofer Backhoe | Aberdeen, SD | — | Installer | — |
| Beus Excavation, LLC | Nampa, ID | — | Installer | — |
| Beutler Excavating | Bismarck, ND | — | Installer | — |
| BG Excavation | Dickinson, ND | — | Installer | — |
| Big D Excavating LLC | Deering, ND | — | Installer | — |
| Big Land Excavation, Llc | Bismarck, ND | — | Installer | — |
| Bill Cassady Enterprises | Sentinel ButteND, ND | — | Installer | — |
| Bismarck Septic & Excavating | Bismarck, ND | Burleigh | Pumper (Class II) | NDSP007352 |
| Bismarck-septic-excavating | Bismarck, ND | — | Installer | — |
| Black Diamond Solutions | Williston, ND | — | Installer | — |
| Black Water Bandit LLC | Hazen, ND | Mercer | Pumper (Class II) | NDSP007355 |
| Black Water Pumping & Septic Service | Hatton, ND | Steele | Pumper (Class I) | NDSP007337 |
| Black's Well Service | Williston, ND | — | Installer | — |
| Bob's Excavating | Valley City, ND | — | Installer | — |
| Bohl Trenching | Thompson, ND | — | Installer | — |
| Boote Portable Toilets | Binford, ND | Griggs | Pumper (Class I) | NDSP007344 |
| Boote Septic Solutions | Binford, ND | Griggs | Pumper (Class II) | NDSP007353 |
| Borderline LLC | Bottineau, ND | — | Installer | — |
| Bottineau Plumbing & Heating | Bottineau, ND | — | Installer | — |
| Bottineau Plumbing and Heating | Bottineau, ND | Bottineau | Pumper (Class II) | NDSP007385 |
| Bottom Line Excavating | West Fargo, ND | — | Installer | — |
| Bowers Excavating | Mandan, ND | — | Installer | — |
| Braaten Plumbing | Williston, ND | — | Installer | — |
| Brad Bonnet Contracting, Inc. | Bismarck, ND | — | Installer | — |
| Bridgetown Builders Inc | Valley City, ND | — | Installer | — |
| Bruesch Construction | Amenia, ND | — | Installer | — |
| Buchmeier Earth Moving | Warwick, ND | — | Installer | — |
| Buckmier's Excavating | Hettinger, ND | Adams | Pumper (Class II) | NDSP007307 |
| Buffalo Concrete | Mandan, ND | — | Installer | — |
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