| Company | Location | Certifications | License # |
|---|---|---|---|
| Andrea Jeanne Dowlearn | — | Designer (Site Evaluator) | OS0035060 |
| Chad Darin Watkins | — | Installer (Class I) | OS0039483 |
| Christopher Lawson | — | Installer (Class II) | OS0039952 |
| Colton Louis Conlon | — | Installer (Class I) | OS0039064 |
| Dennis Joe Sr Moore | — | Installer (Class II)Designer (Site Evaluator) | OS0000805 |
| Donald D Metcalf | — | Installer (Class II) | OS0029824 |
| Donald Eugene Barrett | — | Installer (Class II)Designer (Site Evaluator) | OS0003433 |
| Douglas R Rs Dowlearn | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0004089 |
| Doyle W Rs Weeks | — | Designer (Site Evaluator) | OS0009479 |
| Kenneth Ray Eastman | — | Installer (Class II)Designer (Site Evaluator) | OS0006362 |
| Roland H Grant | — | Installer (Class II)Inspector (Maintenance Provider) | OS0041322 |
| Ryan Patrick Moses | — | Installer (Class I) | OS0034723 |
| Thomas W Hampton | — | Installer (Class II)Inspector (Maintenance Provider) | OS0024597 |
| Wayne Bernard Dworaczyk | — | Installer (Class II) | OS0008127 |
| Worth Ross Dubose | — | Installer (Class II) | OS0004327 |
15 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Blanco County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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