| Company | Location | Certifications | License # |
|---|---|---|---|
| Advanced Septic Solutions, Inc. | Montgomery, MN | Designer (Advanced)Inspector (Advanced)Installer | L4331 |
| Braith Excavating Inc | New Prague, MN | Installer | L2442 |
| Burns Construction Inc | Le Sueur, MN | Designer (Advanced)Inspector (Advanced)Installer | L29 |
| Deutsch Construction Inc | New Prague, MN | Installer | L1274 |
| Dirt Diggers Contracting Inc | New Prague, MN | DesignerInspectorInstallerPumper | L790 |
| Hackett Construction LLC | Kilkenny, MN | DesignerInstaller | L3473 |
| James Bros Construction Inc | Elysian, MN | DesignerInspector (Advanced)InstallerPumper | L73 |
| Kopet Construction LLC | Le Center, MN | Installer | L407 |
| Pat McCabe | Cleveland, MN | DesignerInspectorInstaller | L2034 |
| R. T. Excavating & Services, Inc. | Le Center, MN | DesignerInspectorInstaller | L3191 |
| Saint Peter Well Drilling | Kasota, MN | InstallerPumper | L3467 |
| Selly Excavating Inc | Le Center, MN | DesignerInspectorInstaller | L3627 |
| Troy Schoenbauer Construction LLC | New Prague, MN | Installer | L2760 |
| Wagner Septic Services | Cleveland, MN | DesignerInspectorInstaller | L2531 |
14 companies in the Minnesota MPCA SSTS licensed business registry are based in Le Sueur County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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