| Company | Location | Certifications | License # |
|---|---|---|---|
| Alfredo Baldreas Lozano | — | Installer (Class I) | OS0041428 |
| Jesse Martinez | — | Installer (Class I) | OS0007500 |
| Jesus T Hernandez | — | Installer (Class I) | OS0018500 |
3 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Zavala County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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