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| Company | Location | County | Certifications | License # |
|---|---|---|---|---|
| H & K Excavating | Medina, ND | — | Installer | — |
| H&L Safety and Supply, Inc. | Makoti, ND | Ward | Pumper (Class I) | NDSP007271 |
| H2O Well Repair & Backhoe Service | Sidney, MT | — | Installer | — |
| Hager Excavating, LLC | New RockfordND, ND | — | Installer | — |
| Hample Excavation | LaMoure, ND | — | Installer | — |
| Hanson Plumbing and Heating | New England, ND | — | Installer | — |
| Hanson's Excavating Inc | Minot, ND | — | Installer | — |
| Hard Rock Excavation | Hebron, ND | — | Installer | — |
| Harris Construction | Belcourt, ND | — | Installer | — |
| Haugen Excavating | Burlington, ND | — | Installer | — |
| Have Hart LLC | Watford City, ND | — | Installer | — |
| Heartland Excavating LLC | Horace, ND | — | Installer | — |
| Heartland Excavation | Horace, ND | — | Installer | — |
| Heinrich Pumping LLC | Bowman, ND | Bowman | Pumper (Class I) | NDSP007339 |
| Helm Excavating, Inc. | Bismarck, ND | — | Installer | — |
| High Plains Excavating LLC | Williston, ND | — | Installer | — |
| Highmark Dirtworks | Steele, ND | — | Installer | — |
| Hoerner Construction | Dickinson, ND | — | Installer | — |
| Home Base Contractors Inc | Bismarck, ND | — | Installer | — |
| Hometown Septic Service, LLC | Cavalier, ND | Pembina | Pumper (Class II) | NDSP007389 |
| Honsey Leasing, Inc. | Rolette, ND | — | Installer | — |
| Hovda Construction | Spiritwood, ND | — | Installer | — |
| Hovex, Inc. | Watford City, ND | — | Installer | — |
| Howatt's Excavating | Devils Lake, ND | — | Installer | — |
| HR Septic Solutions LLC | Northwood, ND | Grand Forks | Pumper (Class II) | NDSP007360 |
| Hurley Enterprises | Fairview, MT | McKenzie | Pumper (Class I) | NDSP007260 |
| Hurley Enterprises, Inc. | Fairview, MT | — | Installer | — |
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