| Company | Location | Certifications | License # |
|---|---|---|---|
| Jeremy Clay | Aurora, MO | Installer (Level Basic) | 38763 |
| Ross Excavating | Mount Vernon, MO | Installer (Level Basic) | 38287 |
2 companies in the Missouri DHSS registered OWTS installer list are based in Lawrence County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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