| Company | Location | Certifications | License # |
|---|---|---|---|
| Mick Mehler And Sons Inc | Silex, MO | Installer (Level Advanced) | 38204 |
| United Property Services | — | Installer (Level Basic) | 38902 |
2 companies in the Missouri DHSS registered OWTS installer list are based in Montgomery County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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