| Company | Location | Certifications | License # |
|---|---|---|---|
| Al Larson & Sons Plumbing and Heating Inc | Preston, MN | Pumper | L605 |
| American Septic Pumping of Spring Valley | Spring Valley, MN | Pumper | L3126 |
| Beer Farms LLC | Preston, MN | DesignerInspectorInstaller | L3139 |
| Bolster Septic & Excavating LLC | Lanesboro, MN | Installer | L4491 |
| Coyote Hill Excavating LLC | Canton, MN | Installer | L3929 |
| Gossman Dirtwork and Septic Services LLC | Preston, MN | DesignerInspectorInstaller | L4280 |
| Griffin Construction Co Inc | Chatfield, MN | Installer | L655 |
| Kennedy Groundworks | Zumbrota, MN | Installer | L4500 |
| STS Plumbing and Heating LLP | Mabel, MN | Designer (Intermediate)InspectorInstaller | L2521 |
| Sveen Excavating LLC | Lanesboro, MN | Installer | L2999 |
| VIS Plumbing & Heating Inc | Lanesboro, MN | DesignerInspectorInstaller | L1218 |
11 companies in the Minnesota MPCA SSTS licensed business registry are based in Fillmore County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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