| Company | Location | Certifications | License # |
|---|---|---|---|
| 4e'S Llc | Sarcoxie, MO | Installer (Level Basic) | 39381 |
| Cox Excavating | Willard, MO | Installer (Level Basic) | 36706 |
| Cox Excavating | Willard, MO | Installer (Level Basic) | 32768 |
| Henson Septic Tanks & Supplies | Neosho, MO | Installer (Level Advanced) | 35761 |
| Howard Hodgson Backhoe Service | Everton, MO | Installer (Level Advanced) | 30569 |
| Jeremy Stafford | Diamond, MO | Installer (Level Basic) | 38681 |
| Jwx | Morrisville, MO | Installer (Level Basic) | 38512 |
| Sanctified Land Services Llc | Mount Vernon, MO | Installer (Level Basic) | 38291 |
| Steven Schneickert | Joplin, MO | Installer (Level Basic) | 38504 |
9 companies in the Missouri DHSS registered OWTS installer list are based in Dade County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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