| Company | Location | Certifications | License # |
|---|---|---|---|
| A&M Construction LLC | Grand Marais, MN | DesignerInstaller | L4374 |
| Aaron Matthew Smith | Grand Marais, MN | Installer | L3671 |
| Berneking Construction, LLC | Grand Marais, MN | Installer | L4102 |
| Bloomquist Construction LLC | Grand Marais, MN | DesignerInstaller | L2967 |
| Charles VanDoren | Schroeder, MN | Installer | L4479 |
| Crawford Excavating LLC | Grand Marais, MN | Installer | L3218 |
| G & G Septic, LLC | Grand Marais, MN | Pumper | L601 |
| Isak Hansen and Sons, Inc. | Lutsen, MN | DesignerInstaller | L651 |
| Laboda Grading Inc. | Grand Marais, MN | Installer | L3476 |
| Lamb Construction | Schroeder, MN | Installer | L1116 |
| Michael Rose Excavating | Lutsen, MN | DesignerInstaller | L611 |
| Rick Backstrom Excavating LLC | Grand Marais, MN | Installer | L4147 |
| SJ Bautch Construction, LLC | Grand Marais, MN | DesignerInstaller | L4344 |
| Skildum & Company LLC | Grand Marais, MN | Designer (Advanced)Installer | L4282 |
| Sugarloaf Property Maintenance LLC | Schroeder, MN | DesignerInstaller | L4316 |
15 companies in the Minnesota MPCA SSTS licensed business registry are based in Cook County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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