| Company | Location | Certifications | License # |
|---|---|---|---|
| Anthony A Jr Machicek | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0024920 |
| Anthony John Maresh | — | Installer (Class II)Designer (Site Evaluator) | OS0001823 |
| Baron W Hanzel | — | Installer (Class II) | OS0038822 |
| Clayton J Walpole | — | Installer (Class II)Inspector (Maintenance Provider) | OS0024927 |
| David M Ehrig | — | Installer (Class II)Designer (Site Evaluator) | OS0027263 |
| Derwyn Dwight Johnson | — | Installer (Class I) | OS0036573 |
| Dwayne D Simper | — | Installer (Class II)Designer (Site Evaluator) | OS0032418 |
| Jeff C Brown | — | Designer (Site Evaluator) | OS0009777 |
| Kevin Paul Etzler | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0006781 |
| Leon J Etzler | — | Installer (Class II)Inspector (Maintenance Provider) | OS0004478 |
| Leroy Jr Mikulencak | — | Installer (Class I) | OS0000647 |
| Seth A Machicek | — | Installer (Class II) | OS0038552 |
| Wilbert Frank Etzler | — | Installer (Class II)Inspector (Maintenance Provider) | OS0000624 |
13 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Lavaca County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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