| Company | Location | Certifications | License # |
|---|---|---|---|
| Brandon Larson | — | Installer (Class II) | OS0038805 |
| Bruce L Williams | — | Installer (Class II)Inspector (Maintenance Provider) | OS0020505 |
| Chantelle M Poole | — | Installer (Class II)Inspector (Maintenance Provider) | OS0038865 |
| Charles C Gattis | — | Inspector (Maintenance Provider) | MP0002308 |
| Chaz Matthew Jackson | — | Installer (Class II) | OS0041104 |
| Chris Edwin Brumley | — | Installer (Class II)Inspector (Maintenance Provider) | OS0037013 |
| Daniel C Brown | — | Installer (Class II)Inspector (Maintenance Provider) | OS0024361 |
| David N Ward | — | Inspector (Maintenance Provider) | MP0002438 |
| Jameison Cooper Shofner | — | Installer (Class II)Inspector (Maintenance Provider) | OS0039492 |
| Jaydon Oleinik | — | Installer (Class II) | OS0037544 |
| Jess Jr Paddy | — | Installer (Class II)Inspector (Maintenance Provider) | OS0029557 |
| Joe Sherwin | — | Designer (Site Evaluator) | OS0038530 |
| John L Rs Katambani | — | Designer (Site Evaluator) | OS0017329 |
| John W Kennedy | — | Installer (Class II)Inspector (Maintenance Provider) | OS0031700 |
| Kaylee Love Kleppelid | — | Designer (Site Evaluator) | OS0036596 |
| Logan H Scott | — | Inspector (Maintenance Provider) | MP0002791 |
| Mac R Ii Louther | — | Installer (Class II)Inspector (Maintenance Provider) | OS0030810 |
| Matthew Love | — | Installer (Class II) | OS0040247 |
| Nathaniel L Grigsby | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0034180 |
| Nolan W Nichols | — | Inspector (Maintenance Provider) | MP0001485 |
| Raymond S Carnley | — | Installer (Class II)Inspector (Maintenance Provider) | OS0038812 |
| Scott S Rohe | — | Installer (Class II)Inspector (Maintenance Provider) | OS0022458 |
| Tyler A Langley | — | Installer (Class II)Inspector (Maintenance Provider) | OS0035908 |
| Warren L Killingsworth | — | Installer (Class II)Inspector (Maintenance Provider) | OS0036012 |
| Wendell H Jr Baker | — | Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0011780 |
25 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Walker County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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