| Company | Location | Certifications | License # |
|---|---|---|---|
| Carl W Keller | — | Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0009261 |
| Dennis Wayne Swan | — | Installer (Class I) | OS0041568 |
| Jeff Richard Keller | — | Installer (Class II)Inspector (Maintenance Provider) | OS0030182 |
| Robert O Jr Speight | — | Designer (Site Evaluator) | OS0031953 |
| Trent Smith | — | Installer (Class I) | OS0041131 |
5 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Marion County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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