| Company | Location | Certifications | License # |
|---|---|---|---|
| Arturo Villalobos Carrasco | — | Installer (Class I) | OS0008248 |
| Ruben V Carrasco | — | Designer (Site Evaluator) | OS0011612 |
2 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Presidio County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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