| Company | Location | Certifications | License # |
|---|---|---|---|
| A-Rite Inc. | St Joseph, MO | Installer (Level Advanced) | 38840 |
| Amos Construction | Agency, MO | Installer (Level Advanced) | 31036 |
| Amos Construction Llc | Agency, MO | Installer (Level Advanced) | 30110 |
| Barnes Plumbing & Septic | Lathrop, MO | Installer (Level Advanced) | 39065 |
| Bbb Construction, Llc | Smithville, MO | Installer (Level Advanced) | 31402 |
| Brian Zellmer | — | Installer (Level Advanced) | 38799 |
| Carl'S Septic Tank & Excavating | Dearborn, MO | Installer (Level Advanced) | 32900 |
| Dump N Pump Septic Llc | Lawson, MO | Installer (Level Basic) | 39489 |
| Edwards Construction | Faucett, MO | Installer (Level Basic) | 39054 |
| Hal Myers Construction | Easton, MO | Installer (Level Basic) | 34421 |
| Hal Myers Construction | Easton, MO | Installer (Level Basic) | 34429 |
| Hensley Nance Excavating | Edgerton, MO | Installer (Level Basic) | 38850 |
| Hensley Nance Excavating | Edgerton, MO | Installer (Level Basic) | 38845 |
| Homeplace Services & Contracting, Llc | Savannah, MO | Installer (Level Advanced) | 32913 |
| Hunsucker Company Llc Dba Swan Plumbing | King City, MO | Installer (Level Basic) | 36806 |
| Hurt Iii Construction | St Joseph, MO | Installer (Level Advanced) | 37665 |
| Knowles Construction Llc | Mound City, MO | Installer (Level Basic) | 38658 |
| Knowles Construction Llc | Mound City, MO | Installer (Level Basic) | 38659 |
| Lj Atkison Underground Homes, Inc | Edgerton, MO | Installer (Level Advanced) | 32064 |
| Lr Excavating | Holt, MO | Installer (Level Basic) | 39523 |
| M&R Dirtwork And Septic Llc | Gower, MO | Installer (Level Basic) | 39151 |
| Mckee Construction Services In | Kansas City, MO | Installer (Level Advanced) | 34933 |
| P & L Plumbing | Gallatin, MO | Installer (Level Basic) | 38857 |
| Perry Plumbing And Septic Llc | Rock Port, MO | Installer (Level Basic) | 39084 |
| Rauch Construction | Oregon, MO | Installer (Level Advanced) | 32884 |
| Reed Sewer | St. Joseph, MO | Installer (Level Basic) | 39060 |
| Reed Sewer Service | Saint Joseph, MO | Installer (Level Advanced) | 32077 |
| S & L Plumbing And Septic Llc | Dearborn, MO | Installer (Level Advanced) | 39045 |
| Scott Gann Construction | St. Joseph, MO | Installer (Level Basic) | 38693 |
| Scott Gann Construction | Saint Joseph, MO | Installer (Level Basic) | 31023 |
| St. Joseph Plumbing | St. Josesph, MO | Installer (Level Basic) | 39035 |
| Stanton Dirt Works | Agency, MO | Installer (Level Basic) | 39513 |
| Stinnett Construction Company, Inc | Platte City, MO | Installer (Level Basic) | 32926 |
| Swan Plumbing | King City, MO | Installer (Level Advanced) | 32434 |
| Tall Guy Waste Water Solutions & Soils, Llc | Maryville, MO | Installer (Level Advanced) | 32909 |
| Total Plumbing Llc | Kearney, MO | Installer (Level Advanced) | 39533 |
| White - X Llc | Savannah, MO | Installer (Level Basic) | 38826 |
| Wynes Excavation & Demolition, Inc. | Stewartsville, MO | Installer (Level Advanced) | 32479 |
| Youngs Grading & Septic | Savannah, MO | Installer (Level Basic) | 34467 |
39 companies in the Missouri DHSS registered OWTS installer list are based in Andrew County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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