| Company | Location | Certifications | License # |
|---|---|---|---|
| Anthony B Todd | — | Installer (Class I) | OS0023387 |
| Byron N Green | — | Installer (Class II) | OS0040882 |
| Carl Jason Marasek | — | Installer (Class I) | OS0039677 |
| Christian Michael Brown | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0039689 |
| Christopher Allen Osborne | — | Installer (Class I) | OS0036222 |
| Curtis W Holcombe | — | Installer (Class II) | OS0000636 |
| Dale E Rodgers | — | Installer (Class II) | OS0001271 |
| Daniel Lee Matson | — | Installer (Class II) | OS0040398 |
| Danny M Jr Talley | — | Installer (Class II)Designer (Site Evaluator) | OS0035019 |
| Eduardo Jr Gonzales | — | Installer (Class II)Inspector (Maintenance Provider) | OS0034602 |
| Gary F Wrightman | — | Installer (Class II)Designer (Site Evaluator) | OS0027245 |
| Gavin A Hodge | — | Installer (Class II)Inspector (Maintenance Provider) | OS0036734 |
| Gregg Ray Rs Tieken | — | Designer (Site Evaluator) | OS0011902 |
| Herman A Jr Locke | — | Designer (Site Evaluator) | OS0031950 |
| Jason J Johnson | — | Installer (Class I) | OS0035606 |
| Jerry D Williams | — | Installer (Class II) | OS0021680 |
| Melissa J Mueck | — | Installer (Class II)Inspector (Maintenance Provider) | OS0030741 |
| Nelson R Waltisperger | — | Inspector (Maintenance Provider) | MP0002245 |
| Pattillo Iii Higgins | — | Installer (Class II)Designer (Site Evaluator) | OS0008644 |
| Quinten C Kiolbassa | — | Installer (Class II)Inspector (Maintenance Provider) | OS0004241 |
| Robert E Thomas | — | Installer (Class II) | OS0026998 |
| Ronnie Mack Tumlinson | — | Installer (Class II)Inspector (Maintenance Provider) | OS0034471 |
| Steven Lee Rs Kubena | — | Designer (Site Evaluator) | OS0037188 |
| Tommy Dennis Williams | — | Installer (Class I) | OS0038911 |
| William B Fuller | — | Installer (Class II) | OS0031091 |
25 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Wilson County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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