| Company | Location | Certifications | License # |
|---|---|---|---|
| Arthur Leman | — | Installer (Class I) | OS0036106 |
| David Z Zimmerman | — | Installer (Class II) | OS0026240 |
| Domingo P Jr Garza | — | Installer (Class I) | OS0002575 |
| Guillermo Arteaga | — | Installer (Class I) | OS0039731 |
| Henry C Sr Ortiz | — | Installer (Class I) | OS0023810 |
| Hunter V Ortiz | — | Installer (Class II)Designer (Site Evaluator) | OS0037542 |
| Jaime Cabralez | — | Installer (Class I) | OS0041172 |
| Jhonatan Manuel Arteaga | — | Installer (Class I) | OS0039579 |
| John P Hutchings | — | Installer (Class I) | OS0033553 |
| Joseph G Casey | — | Installer (Class I) | OS0023372 |
| Lee Gregory Wilson | — | Designer (Site Evaluator) | OS0040317 |
| Lucky L Fish | — | Installer (Class II)Designer (Site Evaluator) | OS0034693 |
| Miguel T Iii Vara | — | Installer (Class I) | OS0027765 |
| Pedro R Valdes | — | Installer (Class II) | OS0038800 |
| Rene Nolasco | — | Installer (Class I) | OS0028558 |
| Rick Y Coggins | — | Designer (Site Evaluator) | OS0034709 |
| Robert C Mauldin | — | Installer (Class I) | OS0014218 |
| Santiago Cabalez | — | Installer (Class I) | OS0028493 |
| Stetson John Schuster | — | Installer (Class I) | OS0041167 |
| Teresa D Cabralez | — | Installer (Class I) | OS0033102 |
20 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Uvalde County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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