| Company | Location | Certifications | License # |
|---|---|---|---|
| 3g Excavating Llc | Farmington, MO | Installer (Level Advanced) | 39424 |
| All Type Septic Pumping & Aeration Llc | Valles Mines, MO | Installer (Level Advanced) | 30530 |
| Benoist Excavating Llc | Irondale, MO | Installer (Level Advanced) | 33583 |
| Boren Contracting Llc | Bonne Terre, MO | Installer (Level Basic) | 38510 |
| Detring Septic Solutions Llc | Park Hills, MO | Installer (Level Basic) | 38522 |
| Gordon Bess Construction Inc | Bonne Terre, MO | Installer (Level Basic) | 35810 |
| Hp Savored Llc | Park Hills, MO | Installer (Level Basic) | 39288 |
| Lord Plumbing Llc | Bonne Terre, MO | Installer (Level Advanced) | 37363 |
| Matt Clifford Excavating | Bonne Terre, MO | Installer (Level Advanced) | 30804 |
| Orrick Excavating & Construction | Middlebrook, MO | Installer (Level Advanced) | 30945 |
| Pristine Contracting Group | Bonne Terre, MO | Installer (Level Advanced) | 38789 |
| Pristine Contracting Group, Llc | Bonne Terre, MO | Installer (Level Advanced) | 38092 |
| Ragsdale Asphalt/Excavating | Bismarck, MO | Installer (Level Advanced) | 39088 |
| Randell Davis | French Village, MO | Installer (Level Basic) | 38159 |
| Straughan Plumbing & Septic Llc | Farmington, MO | Installer (Level Advanced) | 34887 |
| Straughan Plumbing And Septic | Farmington, MO | Installer (Level Advanced) | 38087 |
| Tongay Dirtworks Llc | Park Hills, MO | Installer (Level Basic) | 39298 |
| William H. Bond Engineering | Ste. Genevieve, MO | Installer (Level Basic) | 31375 |
18 companies in the Missouri DHSS registered OWTS installer list are based in Iron County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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