| Company | Location | Certifications | License # |
|---|---|---|---|
| Adalberto Jr Garza | — | Installer (Class I) | OS0036701 |
| Javier Ivan Romero | — | Installer (Class I) | OS0038080 |
| Jorge Chapa | — | Installer (Class II) | OS0018890 |
| Jose Francisco Jr Perez | — | Installer (Class I) | OS0008254 |
| Julio C Garza | — | Installer (Class I) | OS0036936 |
| Mario David Benavides | — | Installer (Class I) | OS0036613 |
| Mateo Moreno | — | Designer (Site Evaluator) | OS0011539 |
| Omar Gonzalez | — | Installer (Class I) | OS0035750 |
8 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Starr County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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