| Company | Location | Certifications | License # |
|---|---|---|---|
| David Lee Carter | — | Installer (Class II)Designer (Site Evaluator) | OS0008374 |
| Kevin Lawson Hiett | — | Installer (Class II)Designer (Site Evaluator) | OS0028314 |
| Trent D Carter | — | Installer (Class I) | OS0032922 |
3 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Gray County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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