| Company | Location | Certifications | License # |
|---|---|---|---|
| Carlos N Coker | — | Installer (Class II)Designer (Site Evaluator) | OS0027724 |
| Chris Gerrit Postma | — | Installer (Class I) | OS0038304 |
| Daniel E Bade | — | Installer (Class II) | OS0019899 |
| Petrus Erasmus Grobler | — | Installer (Class II) | OS0040439 |
| William Vernon Lucht | — | Installer (Class I) | OS0007415 |
5 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Mills County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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