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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| Lake Region Drilling | Devils Lake, ND | — | Installer | — |
| Lakeside Builders United, LLC | Williston, ND | — | Installer | — |
| Lako Drilling, Inc | Arthur, ND | — | Installer | — |
| Lako Excavating, Paul Lako LLC | Arthur, ND | — | Installer | — |
| Land Restoration Specialists | Williston, ND | — | Installer | — |
| Lenco Construction Inc | Sawyer, ND | — | Installer | — |
| Level One Excavating | Bismarck, ND | — | Installer | — |
| Lindemann Concrete Construction | Harwood, ND | — | Installer | — |
| LinnCo, Inc | St. Cloud, MN | — | Installer | — |
| Lisbon Septic Service | Lisbon, ND | Ransom | Pumper (Class II) | NDSP007288 |
| Lucas Enterprises, LLC | Bismarck, ND | Burleigh | Pumper (Class II) | NDSP007374 |
| Lucky's Septic Service | Valley City, ND | Barnes | Pumper (Class I) | NDSP007323 |
| Lund Construction | Crosby, ND | — | Installer | — |
| Lunde Development, Llc | Bismarck, ND | — | Installer | — |
| Lunneborg Legacy Excavation, Llc | Bismarck, ND | — | Installer | — |
| Lupine Construction Inc. | Watford City, ND | — | Installer | — |
| Lupine Construction, Inc. | Alexander, ND | — | Installer | — |
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