| Company | Location | Certifications | License # |
|---|---|---|---|
| Brett L Hutto | — | Installer (Class II) | OS0005726 |
| Chester L Maples | — | Installer (Class II) | OS0000304 |
| Corey Edward Mangold | — | Designer (Site Evaluator) | OS0039119 |
| David Aguirre | — | Installer (Class II) | OS0040097 |
| David Alvarez Loera | — | Installer (Class II) | OS0004014 |
| David J Zinsmeister | — | Installer (Class II)Designer (Site Evaluator) | OS0002580 |
| Denise Jones | — | Installer (Class II) | OS0037539 |
| Eddie Newman | — | Installer (Class I)Designer (Site Evaluator) | OS0000314 |
| Garrett Welch | — | Installer (Class I) | OS0038470 |
| Gregory E Mcmillan | — | Installer (Class II) | OS0000306 |
| Jeffery J Tondre | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0019901 |
| Jeremiah W Partin | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0027554 |
| Joel Hernandez | — | Installer (Class I) | OS0038563 |
| Jon M Blake | — | Installer (Class II) | OS0027814 |
| Josiah C Peterson | — | Installer (Class I) | OS0040846 |
| Justin Ryan Jones | — | Installer (Class I) | OS0035512 |
| Kevin Gear | — | Installer (Class I) | OS0038333 |
| Martin R Perez | — | Installer (Class II)Designer (Site Evaluator) | OS0033180 |
| Michael V Aguirre | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0035002 |
| Mitchell Long | — | Installer (Class I) | OS0039059 |
| Randall James Jungman | — | Installer (Class I) | OS0022556 |
| Robert Micheal Buvinghausen | — | Installer (Class II) | OS0029636 |
| Steve Wayne Gilliam | — | Installer (Class II) | OS0004356 |
| Thomas Caleb Zinsmeister | — | Installer (Class I) | OS0041160 |
24 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Medina County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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