| Company | Location | Certifications | License # |
|---|---|---|---|
| Eliseo Jr Barnhart | — | Installer (Class I) | OS0006669 |
| Vicente Sr Rodriguez | — | Installer (Class I) | OS0037910 |
2 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Willacy County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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