| Company | Location | Certifications | License # |
|---|---|---|---|
| Ark Plumbing Llc | Holt, MO | Installer (Level Advanced) | 33825 |
| B & M Septic & Construction, Llc | Kidder, MO | Installer (Level Advanced) | 37601 |
| B&M Septic And Construction Llc | Kidder, MO | Installer (Level Advanced) | 38366 |
| B&M Septic And Construction Llc | Kidder, MO | Installer (Level Basic) | 39083 |
| Blaine Watkins | Wood Heights, MO | Installer (Level Basic) | 38579 |
| Bm Septic | Kidder, MO | Installer (Level Basic) | 38696 |
| Clint Evans Htg & Clg | Richmond, MO | Installer (Level Advanced) | 36246 |
| Constant And Sons Digging | Chillicothe, MO | Installer (Level Advanced) | 37832 |
| Cooters Plumbing | Lathrop, MO | Installer (Level Basic) | 37661 |
| Cooters Plumbing & Septic | Lathrop, MO | Installer (Level Advanced) | 36447 |
| Dykes Construction | Lawson, MO | Installer (Level Advanced) | 30618 |
| Dykes Construction Llc | Lawson, MO | Installer (Level Advanced) | 37274 |
| Gates Plumbing And Backhoe | Cameron, MO | Installer (Level Basic) | 32179 |
| Grubbs Construction, Llc | Cameron, MO | Installer (Level Basic) | 38931 |
| Harry Jeffries | — | Installer (Level Advanced) | 39400 |
| High Flow Drainage Solutions | Rayville, MO | Installer (Level Basic) | 38774 |
| Howerton Ditching | Excelsior Springs, MO | Installer (Level Basic) | 30648 |
| Jim Jones | Independence, MO | Installer (Level Advanced) | 31692 |
| Lr Excavating | Holt, MO | Installer (Level Basic) | 39549 |
| Meridian Home Services | Kansas City, MO | Installer (Level Advanced) | 37705 |
| Phil Hutchison Excavating & Plumbing Llc | Excelsior Springs, MO | Installer (Level Basic) | 30649 |
| Potts And Sons | Chillicothe, MO | Installer (Level Basic) | 38070 |
| Quick Works | Lawson, MO | Installer (Level Basic) | 38005 |
| Viking Dirtworks And Landscaping Llc | Gallatin, MO | Installer (Level Advanced) | 37101 |
24 companies in the Missouri DHSS registered OWTS installer list are based in Caldwell 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.