| Company | Location | Certifications | License # |
|---|---|---|---|
| Acme Plumbing Inc Dba Gercken Comp Llc | Liberty, MO | Installer (Level Advanced) | 34138 |
| Advanced Septic Technologies | Gladstone, MO | Installer (Level Advanced) | 35465 |
| Amh Excavating Llc | Sibley, MO | Installer (Level Advanced) | 39536 |
| Benjamin Franklin Plumbing | Lees Summit, MO | Installer (Level Basic) | 38843 |
| Bob Hamilton Plumbing | Overland Park, MO | Installer (Level Basic) | 38781 |
| Bob Hamilton Plumbing | Overland Park, MO | Installer (Level Basic) | 38778 |
| Burns Construction And Excavtion | Kingsville, MO | Installer (Level Basic) | 38505 |
| Cato Septic | Kingsville, MO | Installer (Level Basic) | 39117 |
| Chapman Septic Service | Independence, MO | Installer (Level Basic) | 38841 |
| Collins Trenching & Excavating | Holden, MO | Installer (Level Advanced) | 37331 |
| Corum Plumbing Llc | Lee'S Summit, MO | Installer (Level Basic) | 39467 |
| Crall Septic Installation & Repair Llc | Oak Grove, MO | Installer (Level Advanced) | 35373 |
| D & C Plumbing Llc Dba Accu Llc | Blue Springs, MO | Installer (Level Advanced) | 38350 |
| D And C Plumbing Llc Dba Accu Plumbing Llc | Blue Springs, MO | Installer (Level Basic) | 38682 |
| Dads Septic Service | Buckner, MO | Installer (Level Basic) | 37907 |
| Dirt Movers Excavating | Pleasant Hill, MO | Installer (Level Basic) | 39158 |
| Dunlap Plubing, Inc | Blue Springs, MO | Installer (Level Advanced) | 30904 |
| Dunlap Plumbing Inc | Blue Springs, MO | Installer (Level Basic) | 38119 |
| Full Nelson Services | North Kansas City, MO | Installer (Level Advanced) | 38873 |
| Gibson Maintenance And Repair Llc | Kansas City, MO | Installer (Level Basic) | 37527 |
| Glas Llc | Mclouth, MO | Installer (Level Advanced) | 37994 |
| Goodman Plumbing And Excavation Llc | Oak Grove, MO | Installer (Level Advanced) | 38461 |
| Hg Consult Inc | Grain Valley, MO | Installer (Level Advanced) | 31032 |
| Honey-Wagon Septic And Grease | Stilwell, MO | Installer (Level Basic) | 39421 |
| Hopkins Lawn & Landscape | Grandview, MO | Installer (Level Advanced) | 38773 |
| Insigth Sewer Llc | Butler, MO | Installer (Level Basic) | 38530 |
| Ja Baker Construction Llc | Centerview, MO | Installer (Level Basic) | 39127 |
| Kb Construction Services Llc | Pleasant Hill, MO | Installer (Level Advanced) | 36828 |
| Kpz Quality Investments | Lone Jack, MO | Installer (Level Basic) | 39416 |
| Lexington Plumbing | Kansas City, MO | Installer (Level Advanced) | 37970 |
| Lexington Plumbing | Kansas City, MO | Installer (Level Advanced) | 35955 |
| Mason Weber | — | Installer (Level Advanced) | 39498 |
| Mathews Septic Service | — | Installer (Level Advanced) | 37327 |
| Nicholas Kephart | Raytown, MO | Installer (Level Basic) | 38585 |
| O & M Enterprises Inc | Holden, MO | Installer (Level Advanced) | 37186 |
| O'Connor Excavation | Raytown, MO | Installer (Level Advanced) | 37831 |
| O&M Enterprises, Inc. | Holden, MO | Installer (Level Advanced) | 36524 |
| Onpoint Home Design & Contracting Llc | Adrian, MO | Installer (Level Advanced) | 39214 |
| Phillips Construction & Excavating Llc | Oak Grove, MO | Installer (Level Advanced) | 36492 |
| Prx Construction | Holden, MO | Installer (Level Advanced) | 39089 |
| Prx Construction | Holden, MO | Installer (Level Advanced) | 39094 |
| Quality Septic & Sewer | Stillwell, MO | Installer (Level Advanced) | 36158 |
| Randigger Llc | Grain Valley, MO | Installer (Level Basic) | 38652 |
| Rite Way Plumbing Llc | Oak Grove, MO | Installer (Level Advanced) | 36840 |
| Rose Septic Tank Cleaning | Grain Valley, MO | Installer (Level Basic) | 39192 |
| S&M Excavating Llc | Garden City, MO | Installer (Level Advanced) | 36434 |
| Serafin Megia | — | Installer (Level Basic) | 38881 |
| St John Property Improvement Company | Knob Noster, MO | Installer (Level Basic) | 38113 |
| The Plumbing Pro | Grandview, MO | Installer (Level Advanced) | 33206 |
| Tri-County Plumbing, Llc | Kingsville, MO | Installer (Level Advanced) | 36429 |
| Veach And Sons Handyman Services | Holden, MO | Installer (Level Basic) | 38973 |
| Wet Environmental Llc | Excelsior Springs, MO | Installer (Level Advanced) | 30617 |
| Zoom Drain | North Kansas City, MO | Installer (Level Advanced) | 39520 |
53 companies in the Missouri DHSS registered OWTS installer list are based in Cass County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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