| Company | Location | Certifications | License # |
|---|---|---|---|
| Britt Dwayne Mcdonald | — | Installer (Class I) | OS0038133 |
| Christopher J Everett | — | Installer (Class I) | OS0029698 |
| Dallas Hale | — | Installer (Class I) | OS0036901 |
| John M Hathcock | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0008317 |
| John Tromza | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0039811 |
| Kenneth T Griffin | — | Installer (Class II)Inspector (Maintenance Provider) | OS0030093 |
| Larry Neeley | — | Installer (Class I) | OS0038982 |
| Mark Randal Mathis | — | Installer (Class I) | OS0036909 |
| Paul Murdock | — | Installer (Class I)Designer (Site Evaluator) | OS0039552 |
| Robyn M Goodson | — | Designer (Site Evaluator) | OS0033730 |
| William D Fincher | — | Installer (Class II) | OS0028138 |
11 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Cass County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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