| Company | Location | Certifications | License # |
|---|---|---|---|
| Cole Burrer | — | Installer (Class I) | OS0040059 |
| Daniel Gonzalez | — | Installer (Class II)Designer (Site Evaluator) | OS0039981 |
| Edward E Jr Bates | — | Installer (Class II)Inspector (Maintenance Provider) | OS0028623 |
| Jacqueline K Scott | — | Designer (Site Evaluator) | OS0019188 |
| Jason Lance Riley | — | Installer (Class II)Designer (Site Evaluator) | OS0028840 |
| Jerry B Truett | — | Designer (Site Evaluator) | OS0032120 |
| Matthew T Waller | — | Installer (Class II)Designer (Site Evaluator) | OS0032847 |
| Rocky N Callaway | — | Installer (Class II) | OS0027368 |
| Samy Young | — | Installer (Class I) | OS0038442 |
9 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Robertson County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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