| Company | Location | Certifications | License # |
|---|---|---|---|
| Aaron L Driggers | — | Installer (Class II)Inspector (Maintenance Provider) | OS0001739 |
| Coleman B Holt | — | Installer (Class II)Designer (Site Evaluator) | OS0032312 |
| Dakota W Exum | — | Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0040333 |
| David Sawatzky | — | Installer (Class II) | OS0040235 |
| Edwin E Holt | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0028348 |
| Jacob Peters Martens | — | Installer (Class II)Designer (Site Evaluator) | OS0040063 |
| Jeremiah C Welch | — | Installer (Class II)Inspector (Maintenance Provider) | OS0034324 |
| Kevin Glenn Clarkson | — | Installer (Class II) | OS0006270 |
| Levi J Holt | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0017964 |
| Silas G Holt | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0034110 |
| Steven Thomas Helms | — | Installer (Class II) | OS0006555 |
| Timothy R Welch | — | Installer (Class II)Inspector (Maintenance Provider) | OS0031451 |
| William S Heuberger | — | Designer (Site Evaluator) | OS0035856 |
| Wyche T Holt | — | Installer (Class II) | OS0034106 |
14 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Lamar County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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