| Company | Location | Certifications | License # |
|---|---|---|---|
| Bobby Logan | — | Inspector (Maintenance Provider) | MP0000551 |
| Brandon Chad Lester | — | Installer (Class I) | OS0040269 |
| Darrell W Miller | — | Installer (Class I) | OS0031904 |
| Gary Gene Griffin | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0031089 |
| Iyyob Y Hawkins | — | Installer (Class II) | OS0026045 |
| Justin English | — | Installer (Class I) | OS0040272 |
| Rex Glendon Jr Maxwell | — | Installer (Class II)Designer (Site Evaluator) | OS0000035 |
| Tovia P Grynewicz | — | Installer (Class II)Inspector (Maintenance Provider) | OS0029998 |
8 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Callahan County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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