| Company | Location | Certifications | License # |
|---|---|---|---|
| Berres Excavating, LLC | Rochester, MN | Installer | L4173 |
| Broken Rock Construction LLC | Rochester, MN | Installer | L4338 |
| Clint Larsen Construction LLC | Byron, MN | Installer | L3087 |
| Decook Excavating Inc | Byron, MN | Installer | L2842 |
| ERH Construction Inc. | Eyota, MN | Installer | L3978 |
| G G G Inc. | Chatfield, MN | Designer (Advanced)Inspector (Advanced) | L686 |
| Gopher Septic Service Inc | Rochester, MN | Designer (Advanced)Inspector (Advanced)InstallerPumper | L866 |
| Hebl Septic LLC | Stewartville, MN | Installer | L4026 |
| High Forest Bobcat Service Inc. | Stewartville, MN | Installer | L4448 |
| Irish Excavating Inc | Eyota, MN | Installer | L2218 |
| J's Excavating and Trucking LLC | Rochester, MN | Installer | L4337 |
| Ottman Excavating Inc | Oronoco, MN | Installer | L2421 |
| Pit Stop Portable Outhouses LLC | Stewartville, MN | Pumper | L3042 |
| Severson Construction | Hayfield, MN | DesignerInstaller | L254 |
| T G Swanson Excavating Inc | Rochester, MN | DesignerInstaller | L784 |
| WSE Engineering Services LTD | Rochester, MN | Designer (Advanced)Inspector (Advanced) | L4208 |
16 companies in the Minnesota MPCA SSTS licensed business registry are based in Olmsted County as of 2026-07-23. Companies based elsewhere in Minnesota also commonly serve the county.
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