| Company | Location | Certifications | License # |
|---|---|---|---|
| Boening Brothers Construction Service LLP | Mapleton, MN | InspectorInstaller | L146 |
| Bolton & Menk, Inc. | Mankato, MN | Designer (Advanced)Inspector (Advanced) | L1241 |
| Corey Seppmann Well Drilling Co | Mankato, MN | DesignerInspectorInstallerPumper | L1935 |
| Crystal Construction LLC | Lake Crystal, MN | DesignerInstaller | L1642 |
| Forrey Septic Systems & Excavating LLC | Mankato, MN | DesignerInstaller | L1539 |
| J R Bruender Construction Inc | Eagle Lake, MN | DesignerInspectorInstallerPumper | L57 |
| Jadd Seppmann & Sons Inc | Mankato, MN | Designer (Advanced)Inspector (Advanced)InstallerPumper | L310 |
| Peterson Motor Grader Service LLC | Vernon Center, MN | DesignerInstaller | L614 |
| Stevens Bobcat and Backhoe | Vernon Center, MN | Installer | L1118 |
| Veith Construction LLC | Mankato, MN | DesignerInstaller | L3922 |
10 companies in the Minnesota MPCA SSTS licensed business registry are based in Blue Earth County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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