| Company | Location | Certifications | License # |
|---|---|---|---|
| David Kyle Bonnet | — | Installer (Class I) | OS0038316 |
| David Lee Wozniak | — | Installer (Class I) | OS0039915 |
| Henry Jr Guerra | — | Installer (Class I) | OS0036965 |
| James Cody Brown | — | Installer (Class I) | OS0034422 |
| James Harold Rs Matthews | — | Designer (Site Evaluator) | OS0007744 |
| Kyle Logan Savage | — | Installer (Class I) | OS0039508 |
| Michael D Wozniak | — | Installer (Class II)Designer (Site Evaluator) | OS0022295 |
| Nathan L Moy | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0019894 |
| Ronald K Edwards | — | Inspector (Maintenance Provider) | MP0001994 |
9 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Karnes County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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