| Company | Location | Certifications | License # |
|---|---|---|---|
| Kurtis Shannon Jennings | — | Installer (Class I) | OS0035735 |
| Roberto S Sr Pequeno | — | Installer (Class I) | OS0008862 |
| Victor R Villarreal | — | Installer (Class I) | OS0036515 |
3 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Frio County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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