| Company | Location | Certifications | License # |
|---|---|---|---|
| A & T Septic and Excavating Services Inc | Spicer, MN | DesignerInspectorInstallerPumper | L1608 |
| Advanced Property Inspection Inc | New London, MN | DesignerInspector | L3852 |
| Bollig, Inc. | Willmar, MN | Designer (Advanced)Inspector | L2986 |
| Efficient Septic Pumping & Drain Cleaning, Inc | New London, MN | DesignerInspectorInstallerPumper | L3164 |
| Elite Septics & Excavating, L.L.C. | Lake Lillian, MN | DesignerInstaller | L4377 |
| Ellingboe Trucking and Excavating LLC | Kandiyohi, MN | Installer | L2341 |
| J Swart Excavating LLC | New London, MN | DesignerInstaller | L3626 |
| J V Excavating, Inc. | Atwater, MN | Installer | L1326 |
| Kandi-Lake Excavating, Inc. | Lake Lillian, MN | Designer (Intermediate)Inspector (Intermediate)InstallerPumper | L1368 |
| Litzau Farm Drainage, Inc | Atwater, MN | Installer | L3910 |
| Marcus Well Drilling Inc | Renville, MN | Pumper | L2436 |
| Mid-Central Contracting | Spicer, MN | Installer | L1121 |
| Oakridge Construction Inc | New London, MN | DesignerInspectorInstaller | L2543 |
| Steven A Whitcomb | Lake Lillian, MN | DesignerInstaller | L1303 |
| Swenson & Sons Construction Inc | New London, MN | Installer | L648 |
| Thonvold Excavating LLC | Sunburg, MN | DesignerInstallerPumper | L1849 |
| Vreeman Construction, Inc. | Willmar, MN | Installer | L843 |
| Ziemer Home & Septic Inspection LLC | Belgrade, MN | DesignerInspectorInstaller | L4169 |
18 companies in the Minnesota MPCA SSTS licensed business registry are based in Kandiyohi County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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