| Company | Location | Certifications | License # |
|---|---|---|---|
| Barber Sewer & Ditching | Kearney, MO | Installer (Level Advanced) | 35697 |
| Christal Hicks | — | Installer (Level Basic) | 38932 |
| H & H Septic Service | Platte, MO | Installer (Level Advanced) | 39064 |
| Hayes Ditching Inc | Oak Grove, MO | Installer (Level Advanced) | 34255 |
| Howerton Ditching | Excelsior Springs, MO | Installer (Level Basic) | 38268 |
| Martin Mechanical | Kansas City, MO | Installer (Level Basic) | 38949 |
| Reynolds Farms | Orrick, MO | Installer (Level Advanced) | 37575 |
| Selby Excavating Llc | Kearney, MO | Installer (Level Advanced) | 37686 |
| Sims Sub-Services Llc | Lee'S Summit, MO | Installer (Level Advanced) | 35606 |
| True Blue Plumbing Llc | Kansas City, MO | Installer (Level Basic) | 38836 |
10 companies in the Missouri DHSS registered OWTS installer list are based in Clay County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
Tell us what you need — we'll connect you with state-certified companies serving your area. No obligation.