| Company | Location | Certifications | License # |
|---|---|---|---|
| Martin Trenching & Backhoe | Taylor, MO | Installer (Level Basic) | 30215 |
| Terry Lake Construction | Hannibal, MO | Installer (Level Advanced) | 32001 |
| Tom Stark Construction | Maywood, MO | Installer (Level Advanced) | 34087 |
3 companies in the Missouri DHSS registered OWTS installer list are based in Lewis County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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