| Company | Location | Certifications | License # |
|---|---|---|---|
| Andrew Williams | — | Installer (Class II)Designer (Site Evaluator) | OS0039326 |
| Austin Gibson | — | Designer (Site Evaluator) | OS0036475 |
| Benjamin Flores | — | Installer (Class I) | OS0041320 |
| Bradley J Hodges | — | Designer (Site Evaluator) | OS0030816 |
| Bryan Lanting | — | Installer (Class I) | OS0038748 |
| Carlton L Fain | — | Installer (Class II) | OS0002670 |
| Cole Leatherwood | — | Installer (Class I) | OS0038688 |
| David M Cary | — | Installer (Class II) | OS0040806 |
| Eddie Leatherwood | — | Installer (Class II) | OS0031798 |
| Gratton R Jr Williams | — | Installer (Class II)Inspector (Maintenance Provider) | OS0018296 |
| Jacob South | — | Installer (Class I) | OS0040994 |
| James David Halford | — | Installer (Class I) | OS0040020 |
| Jared D Scott | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0035813 |
| Jeannie L Stacks | — | Designer (Site Evaluator) | OS0031537 |
| Jeremy Albert Phillips | — | Installer (Class II)Inspector (Maintenance Provider) | OS0039828 |
| Jim Bob Stoebner | — | Installer (Class I) | OS0039638 |
| Jim Ray Scroggins | — | Installer (Class II) | OS0001038 |
| John L Sackett | — | Designer (Site Evaluator) | OS0040940 |
| John N Pe Williams | — | Installer (Class I)Designer (Site Evaluator) | OS0032820 |
| Jordan Paul Davis | — | Installer (Class I) | OS0040116 |
| Julian Medina | — | Installer (Class I) | OS0040482 |
| Keith Wilson Bailey | — | Designer (Site Evaluator) | OS0034005 |
| Lawrence D Cremean | — | Inspector (Maintenance Provider) | MP0002164 |
| Luis Pagan | — | Inspector (Maintenance Provider) | MP0002599 |
| Manuel Ignacio Vargas | — | Installer (Class I) | OS0040944 |
| Michael Davis Herod | — | Installer (Class I) | OS0035213 |
| Morgan Cosmo Flint | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0041156 |
| Silviano Garcia | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0039341 |
| Sterling R Smith | — | Installer (Class I) | OS0030348 |
| Tanner L Thornburg | — | Installer (Class II) | OS0032098 |
| Timothy W Mcmillian | — | Installer (Class II) | OS0021344 |
| Victor M Ashe | — | Designer (Site Evaluator) | OS0022976 |
| William Dennis Hendrix | — | Installer (Class I) | OS0039007 |
| William Garrett Henderson | — | Installer (Class II)Designer (Site Evaluator) | OS0039138 |
| William James Davis | — | Installer (Class I) | OS0039550 |
35 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Erath County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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