| Company | Location | Certifications | License # |
|---|---|---|---|
| Eric Warnecke | Two Harbors, MN | DesignerInstaller | L3099 |
| Haugan Construction | Two Harbors, MN | Designer (Advanced)InspectorInstallerPumper | L1652 |
| JBL Trucking & Excavating LLC | Two Harbors, MN | Installer | L4017 |
| Joe Hall Excavating | Schroeder, MN | Installer | L4180 |
| Matt Lundgren's Septic Pumping | Two Harbors, MN | Pumper | L4336 |
| Ostman Trucking & Excavating, LLC | Two Harbors, MN | DesignerInstaller | L245 |
| Stony River Trucking, Inc. | Isabella, MN | DesignerInstaller | L4025 |
| Superior Septic Service LLC | Two Harbors, MN | Pumper | L3896 |
| Terra Firma | Finland, MN | Designer (Advanced)Inspector (Advanced)Installer | L1110 |
| Warnecke Construction LLC | Silver Bay, MN | DesignerInspectorInstaller | L4239 |
10 companies in the Minnesota MPCA SSTS licensed business registry are based in Lake County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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