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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| C & L Backhoe Service | Stanton, ND | — | Installer | — |
| Capex Oilfield Services Inc | Williston, ND | Williams | Pumper (Class II) | NDSP07406 |
| Carr Construction | Carrington, ND | — | Installer | — |
| Casey Sadek | Valley City, ND | — | Installer | — |
| Cassady Enterprise | Sentinel ButteND, ND | — | Installer | — |
| CCK Dirtwork LLC | Kalispell, MT | — | Installer | — |
| Central City Excavating | Carrington, ND | — | Installer | — |
| Central Excavation | Carrington, ND | — | Installer | — |
| Charging Eagles Enterprises, LLC. | Killdeer, ND | Dunn | Pumper (Class I) | NDSP07409 |
| CHR Construction Services LLC | Sabin, MN | — | Installer | — |
| Clark and Sons Earthworks Consulting LLC | Williston, ND | — | Installer | — |
| Clark's Excavating & Septic | Moorhead, MN | — | Installer | — |
| Cody Echevarria Construction LLC | Williston, ND | — | Installer | — |
| Cordova Construction | Dickinson, ND | — | Installer | — |
| Coreys Septic Service | Williston, ND | — | Installer | — |
| Cousin Freddy's Septic Service LLC | Upham, ND | McHenry | Pumper (Class I) | NDSP007384 |
| Coyote Construction | Velva, ND | — | Installer | — |
| Creative Construction, Llc | Mandan, ND | — | Installer | — |
| Custom Contracting Solutions, LLC | Jamestown, ND | — | Installer | — |
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