| Company | Location | Certifications | License # |
|---|---|---|---|
| Conner Excavating & Construction | Neosho, MO | Installer (Level Basic) | 33244 |
| Duffers Septic Solutions | Seneca, MO | Installer (Level Basic) | 38073 |
2 companies in the Missouri DHSS registered OWTS installer list are based in Berry County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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