| Company | Location | Certifications | License # |
|---|---|---|---|
| A & C Excavating LLC | Marshall, MN | DesignerInstaller | L3048 |
| Action Company LLC | Marshall, MN | Installer | L4214 |
| D & G Excavating Inc. | Marshall, MN | DesignerInstaller | L4416 |
| Enviro Pump Plus | Balaton, MN | InspectorPumper | L3989 |
| Heartland Mechanical Inc | Balaton, MN | DesignerInspectorInstaller | L328 |
| Hodges Construction & Electrical LLC | Russell, MN | DesignerInstaller | L911 |
| Johnson Trenching Co | Russell, MN | DesignerInstaller | L1753 |
| Kevin Goslar Trio Plumbing & Heating LLC | Marshall, MN | Installer | L839 |
| Laleman Septic & Plumbing LLC | Ghent, MN | Installer | L4333 |
| Laleman's Septic and Drain Services LLC | Ghent, MN | Pumper | L1999 |
| Southwest Sanitation Inc. | Marshall, MN | Pumper | L2916 |
| WB Excavating and Septic L.L.C. | Cottonwood, MN | DesignerInstaller | L220 |
| Wilk's Plumbing, LLC | Tracy, MN | Installer | L3860 |
13 companies in the Minnesota MPCA SSTS licensed business registry are based in Lyon County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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