| Company | Location | Certifications | License # |
|---|---|---|---|
| Elizabeth A Pate | — | Designer (Site Evaluator) | OS0020584 |
| Lance T Landers | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0030278 |
| Randall I Pate | — | Installer (Class I) | OS0018507 |
3 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Coke County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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