| Company | Location | Certifications | License # |
|---|---|---|---|
| Beemer Well Drilling Inc. | Fairmont, MN | Designer (Advanced)Inspector (Advanced)InstallerPumper | L806 |
| Bobs Biffys LLC | Fairmont, MN | DesignerInstallerPumper | L1383 |
| Douglas Closs Septic and Backhoe Service | Fairmont, MN | DesignerInstallerPumper | L1693 |
| Ekstrom Brothers Drainage LLC | Truman, MN | Installer | L4357 |
| Fuller Excavation LLC | Sherburn, MN | Installer | L3968 |
5 companies in the Minnesota MPCA SSTS licensed business registry are based in Martin County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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