| Company | Location | Certifications | License # |
|---|---|---|---|
| Aaron Gonzalez | — | Installer (Class I) | OS0029970 |
| Alarico Trevino | — | Installer (Class I) | OS0008066 |
| Alberto Eduardo Flores | — | Installer (Class I) | OS0039329 |
| Andrey Pena | — | Installer (Class I) | OS0038799 |
| Aniceto Rs Izaguirre | — | Installer (Class I)Designer (Site Evaluator) | OS0002700 |
| Carlos Trejo | — | Installer (Class I) | OS0040389 |
| Daniel Montanez | — | Installer (Class II) | OS0039809 |
| Edward J Coogan | — | Installer (Class II) | OS0012854 |
| Elizabeth Hernandez | — | Installer (Class I) | OS0041254 |
| Felix A Trevino | — | Installer (Class II) | OS0034418 |
| Florencio Gandaria | — | Installer (Class I) | OS0039524 |
| Gilberto Montanez | — | Installer (Class I) | OS0040308 |
| Gustavo Perez Chapa | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0001948 |
| Humberto Barva | — | Installer (Class I) | OS0040678 |
| Isaac Sr Mata | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0004378 |
| Jacob Garza | — | Installer (Class II)Designer (Site Evaluator) | OS0034892 |
| Javier Rios | — | Installer (Class II) | OS0039831 |
| Jose A Gonzalez | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0001350 |
| Jose A Iii Gonzalez | — | Installer (Class II) | OS0035502 |
| Jose G Gonzales | — | Installer (Class I)Designer (Site Evaluator) | OS0040014 |
| Jose Rosales | — | Installer (Class I) | OS0001364 |
| Juan Sergio Rodriguez | — | Installer (Class II) | OS0037635 |
| Leonardo V Carranza | — | Installer (Class I) | OS0020191 |
| Leonel Luis Nordhausen | — | Installer (Class I) | OS0035959 |
| Lisandro Hernandez | — | Installer (Class II)Designer (Site Evaluator) | OS0006086 |
| Lombardo Bazan | — | Installer (Class II)Designer (Site Evaluator) | OS0036943 |
| Luz M Gomez | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0034530 |
| Monica Y Rodriguez | — | Installer (Class I) | OS0023809 |
| Oraldo Cardoza | — | Installer (Class I) | OS0031606 |
| Patricia Espericueta | — | Installer (Class I) | OS0006046 |
| Raul C Cantu | — | Installer (Class II) | OS0037822 |
| Ricardo Jr Caballero | — | Installer (Class II) | OS0002397 |
| Richard Costello | — | Installer (Class I) | OS0040608 |
| Robert C Nava | — | Installer (Class II)Designer (Site Evaluator) | OS0004873 |
| Rodolfo Rios | — | Designer (Site Evaluator) | OS0034720 |
| Valentin Perez | — | Installer (Class I) | OS0008943 |
36 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Hidalgo County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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