| Company | Location | Certifications | License # |
|---|---|---|---|
| Benjamin Anson Ball | — | Installer (Class II)Designer (Site Evaluator) | OS0031139 |
| Christopher G Strackbein | — | Installer (Class II) | OS0033717 |
| Dave Allen Smith | — | Installer (Class II)Designer (Site Evaluator) | OS0025584 |
| Don Wayne Smith | — | Installer (Class II)Inspector (Maintenance Provider) | OS0004968 |
| Dwayn Carlton Boos | — | Installer (Class II)Designer (Site Evaluator) | OS0006445 |
| Jarrett Coy Beard | — | Installer (Class I) | OS0039730 |
| Jason C Hajek | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0031134 |
| John Lawrence Geyer | — | Installer (Class II) | OS0039768 |
| Jonathon Gillis | — | Installer (Class II)Designer (Site Evaluator) | OS0038279 |
| Joshua Wayne Smith | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0029932 |
| Judge Michael Edwards | — | Installer (Class I) | OS0040111 |
| Justin Cop | — | Installer (Class I) | OS0040865 |
| Kenneth James Feller | — | Installer (Class II)Designer (Site Evaluator) | OS0008264 |
| Kyle Zavala | — | Installer (Class II)Designer (Site Evaluator) | OS0038573 |
| Lee B Porter | — | Installer (Class II) | OS0035253 |
| Luke Tillman | — | Installer (Class I) | OS0039090 |
| Patricia A Smith | — | Installer (Class I) | OS0025522 |
| Paul Iii Hartcraft | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0003701 |
| Paul Iv Hartcraft | — | Installer (Class II)Inspector (Maintenance Provider) | OS0030526 |
| Rhett J Schladoer | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0022918 |
| Richard Michael Reid | — | Designer (Site Evaluator) | OS0041482 |
| Ruben Aguilar | — | Installer (Class II) | OS0036594 |
| Sarah Jennette Geyer | — | Designer (Site Evaluator) | OS0038652 |
| Scott W Doerr | — | Inspector (Maintenance Provider) | MP0002525 |
| Sheryl Ann Sutton | — | Designer (Site Evaluator) | OS0010302 |
| Timothy Richard Neff | — | Installer (Class II)Inspector (Maintenance Provider) | OS0007046 |
| Usiel Aguilar | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0031140 |
| Will Weinheimer | — | Designer (Site Evaluator) | OS0035834 |
28 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Gillespie County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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