| Company | Location | Certifications | License # |
|---|---|---|---|
| A & M Contracting Services Llc | Warrenton, MO | Installer (Level Basic) | 39182 |
| A & S Septic And Utilities Llc | New Melle, MO | Installer (Level Advanced) | 37553 |
| A & S Septic And Utilities Llc | New Melle, MO | Installer (Level Basic) | 36509 |
| A.R.C. Grading Llc | Moscow Mills, MO | Installer (Level Advanced) | 37724 |
| Accurate Septic & Well Inspections | St. Clair, MO | Installer (Level Advanced) | 30074 |
| Advanced Septic & Trenching | Old Monroe, MO | Installer (Level Advanced) | 36665 |
| American Htg/Clg/Elect/Plbg | Silex, MO | Installer (Level Advanced) | 31035 |
| B&J Septic | Silex, MO | Installer (Level Advanced) | 31527 |
| Bill Sullivan Excavation | Silex, MO | Installer (Level Basic) | 31535 |
| Bruce Tucker & Sons Septic Llc | Silex, MO | Installer (Level Advanced) | 30047 |
| Bylo Brothers Inc | Wright City, MO | Installer (Level Advanced) | 38055 |
| Carter Backhoe | Wentzville, MO | Installer (Level Advanced) | 31609 |
| Clubbs Home Remodeling | Ofallon, MO | Installer (Level Basic) | 38921 |
| Dalton Cain | — | Installer (Level Basic) | 39007 |
| Donald R Counts | Middletown, MO | Installer (Level Basic) | 39008 |
| Flynn Drilling Co | Troy, MO | Installer (Level Basic) | 37113 |
| Flynn Drilling Co. | Troy, MO | Installer (Level Basic) | 37114 |
| Four Seasons Ground Maintenance | Wentzville, MO | Installer (Level Basic) | 38912 |
| Garrett Concrete & Const. Inc | Wright City, MO | Installer (Level Advanced) | 38411 |
| Jdmt, Llc | Troy, MO | Installer (Level Advanced) | 38064 |
| Jemm Excavating Inc | St. Charles, MO | Installer (Level Advanced) | 37679 |
| Klemme'S Backhoe Service | Wentzville, MO | Installer (Level Advanced) | 31367 |
| Klemmes Backhoe Service | Wentzville, MO | Installer (Level Advanced) | 39469 |
| Luke Willis | Troy, MO | Installer (Level Advanced) | 39247 |
| M Turpin Services Llc | Wright City, MO | Installer (Level Advanced) | 36683 |
| Macc Construction Llc | Foristell, MO | Installer (Level Advanced) | 37915 |
| Mick Mehler & Sons, Inc | Silex, MO | Installer (Level Advanced) | 30204 |
| Mick'S Mehler & Sons, Inc | Silex, MO | Installer (Level Advanced) | 30232 |
| Mike Henry Excavating, Llc | Silex, MO | Installer (Level Advanced) | 31635 |
| Modern Pumping And Sewer Services Llc | O'Fallon, MO | Installer (Level Advanced) | 36167 |
| N/A | N/A, MO | Installer (Level Basic) | 39338 |
| Nathan Tannehill | — | Installer (Level Basic) | 39514 |
| Noah Gielow | — | Installer (Level Basic) | 39506 |
| O'Brien Construction & Excavation | Elsberry, MO | Installer (Level Advanced) | 30918 |
| O'Fallon Sewer Service | O'Fallon, MO | Installer (Level Advanced) | 30476 |
| O"Fallon Sewer Service | O'Fallon, MO | Installer (Level Advanced) | 39043 |
| Orf Construction Inc | Bowling Green, MO | Installer (Level Advanced) | 32367 |
| Outdoor Works Llc | Foristell, MO | Installer (Level Advanced) | 37552 |
| Poeling Construction | Foristell, MO | Installer (Level Advanced) | 32051 |
| Rhyno Septic Llc | Troy, MO | Installer (Level Advanced) | 37555 |
| Rust Construction Llc | Innsbrook, MO | Installer (Level Basic) | 30185 |
| S&S Utility Contracting | Ofallon, MO | Installer (Level Basic) | 38598 |
| Scott Cary | Warrenton, MO | Installer (Level Advanced) | 31684 |
| Southern Ditching & Excavating Co | O'Fallon, MO | Installer (Level Basic) | 31084 |
| Sween Co | Wentzville, MO | Installer (Level Advanced) | 38955 |
| Trinity Ditching Llc | Troy, MO | Installer (Level Advanced) | 30158 |
| Trinity Ditching, Llc | Troy, MO | Installer (Level Advanced) | 36909 |
| Turner Septic & Grading Llc | Troy, MO | Installer (Level Advanced) | 39022 |
| Wehmeyer Farm | Moscow Mills, MO | Installer (Level Advanced) | 38127 |
49 companies in the Missouri DHSS registered OWTS installer list are based in Lincoln County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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