| Company | Location | Certifications | License # |
|---|---|---|---|
| Andrew Preston Baker | — | Installer (Class I)Designer (Site Evaluator) | OS0041522 |
| Brooke Makay Meier | — | Installer (Class I) | OS0041126 |
| Cody T Young | — | Installer (Class II)Inspector (Maintenance Provider) | OS0033778 |
| Dalton Lee Holcomb | — | Installer (Class I) | OS0040740 |
| David Chester Iii Meier | — | Installer (Class II)Designer (Site Evaluator) | OS0021098 |
| Dee M Jr Dinscore | — | Installer (Class II) | OS0030963 |
| Douglas E Cotton | — | Installer (Class II) | OS0004244 |
| Gage Young | — | Installer (Class II) | OS0038655 |
| Jack R Davis | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0001644 |
| James D Johnson | — | Installer (Class II)Designer (Site Evaluator) | OS0024598 |
| Jerry D Jr Ivey | — | Installer (Class II) | OS0005434 |
| Jimmy R Ivey | — | Installer (Class II)Designer (Site Evaluator) | OS0003511 |
| John T Jr Montgomery | — | Inspector (Maintenance Provider) | MP0002570 |
| Lance Edward Dillard | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0006566 |
| Lewis L Young | — | Installer (Class I) | OS0040197 |
| Marc A Hanson | — | Installer (Class II) | OS0007585 |
| Matthew J Cooper | — | Installer (Class II) | OS0028819 |
| Maxie Jarrett | — | Installer (Class I) | OS0038772 |
| Michael K Mace | — | Installer (Class II) | OS0029161 |
| Milo A Young | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0035770 |
| Robert William Ivey | — | Installer (Class I) | OS0039328 |
| Shane Alan Flint | — | Designer (Site Evaluator) | OS0037399 |
| Terrell Kevin Gauny | — | Installer (Class II) | OS0003480 |
| Zachary T Riggs | — | Installer (Class II) | OS0035167 |
24 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Llano County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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