| Company | Location | Certifications | License # |
|---|---|---|---|
| Accuro Services,Llc | Wentzville, MO | Installer (Level Advanced) | 39305 |
| Blacktop, Llc | Lynchburg, MO | Installer (Level Advanced) | 39441 |
| Bryan Chaney | — | Installer (Level Advanced) | 39483 |
| C&H Septic Service'S | Moberly, MO | Installer (Level Basic) | 38809 |
| Courtney Construction Llc | Mountain Grove, MO | Installer (Level Advanced) | 38966 |
| Horst Plumbing | Baring, MO | Installer (Level Advanced) | 30222 |
| James Durbin | — | Installer (Level Basic) | 39272 |
| Jeff Davis Trucking & Excavating | Macon, MO | Installer (Level Basic) | 35518 |
| K&P Services Llc | Blue Springs, MO | Installer (Level Basic) | 39567 |
| Keith March Exacavting & Trucking Llc | Macon, MO | Installer (Level Basic) | 33776 |
| Mcgowan Plumbing Llc | Macon, MO | Installer (Level Basic) | 30644 |
| Mid-Mo Complete Septic Services Llc | Moberly, MO | Installer (Level Basic) | 39339 |
| Miller Trenching Llc | Edina, MO | Installer (Level Basic) | 36332 |
| Morgan Wilson | — | Installer (Level Advanced) | 39515 |
| Sam'S Home & Commercial Inspectors | Vichy, MO | Installer (Level Basic) | 39488 |
| Teter Plumbing | Bevier, MO | Installer (Level Basic) | 30247 |
| Tory Mace | — | Installer (Level Advanced) | 39540 |
17 companies in the Missouri DHSS registered OWTS installer list are based in Adair County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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