| Company | Location | Certifications | License # |
|---|---|---|---|
| Edwards Construction | Faucett, MO | Installer (Level Basic) | 39055 |
| Professional Waste Water Services Inc | Shenandoah, MO | Installer (Level Advanced) | 33570 |
2 companies in the Missouri DHSS registered OWTS installer list are based in Atchison County as of 2026-07-23. Companies based elsewhere in Missouri also commonly serve the county.
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