| Company | Location | Certifications | License # |
|---|---|---|---|
| Alan Holmgreen | — | Installer (Class I) | OS0040420 |
| Dorian Ariel Rangel | — | Installer (Class I)Designer (Site Evaluator) | OS0036897 |
| Elva Diana Cantu | — | Designer (Site Evaluator) | OS0036433 |
| Ernesto Garza | — | Installer (Class I)Designer (Site Evaluator) | OS0040828 |
| Fernando Chavarria | — | Installer (Class I) | OS0001380 |
| Guillermo Jr Gallegos | — | Installer (Class I) | OS0001382 |
| Ismael Orozco | — | Installer (Class I) | OS0031690 |
| Ivan Cisneros | — | Installer (Class I) | OS0039765 |
| Jose L Aguilar | — | Installer (Class I) | OS0028061 |
| Pedro Villarreal | — | Installer (Class I) | OS0040192 |
| Rafael Rs Cisneros | — | Installer (Class I)Designer (Site Evaluator) | OS0007020 |
| Raul Gilberto Madrigal | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0038491 |
| Reynaldo Jr Gomez | — | Installer (Class I) | OS0029290 |
| Ricardo Aguilar | — | Installer (Class I) | OS0028570 |
| Tony H Moreno | — | Installer (Class I) | OS0036676 |
| Victor Alfonso Ontiveros | — | Installer (Class I) | OS0037612 |
16 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Webb County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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