| Company | Location | Certifications | License # |
|---|---|---|---|
| Anthony Darren King | — | Installer (Class I) | OS0036394 |
| Bobby C Ray | — | Installer (Class II) | OS0040178 |
| Bobby J Chapman | — | Installer (Class II)Inspector (Maintenance Provider) | OS0022659 |
| Brian C Samford | — | Installer (Class II)Inspector (Maintenance Provider) | OS0035841 |
| Don Marcus Reed | — | Inspector (Maintenance Provider) | MP0002833 |
| Jerry W Brown | — | Installer (Class II)Inspector (Maintenance Provider) | OS0002477 |
| Jimmy R Rash | — | Installer (Class II)Inspector (Maintenance Provider) | OS0000583 |
| Juan Galindo | — | Installer (Class I) | OS0039490 |
| Justin L Lesly | — | Installer (Class II) | OS0033981 |
| Kevin R Prince | — | Designer (Site Evaluator) | OS0033978 |
| Kiley Brad Spence | — | Installer (Class II)Inspector (Maintenance Provider) | OS0027803 |
| Lance Hamilton | — | Installer (Class I) | OS0039137 |
| Larry Don Loper | — | Installer (Class II)Inspector (Maintenance Provider) | OS0003660 |
| Matthew D Dulworth | — | Installer (Class II)Inspector (Maintenance Provider) | OS0008172 |
| Matthew Ryan Tucker | — | Installer (Class II) | OS0039190 |
| Patrick Brown | — | Installer (Class II) | OS0040476 |
| Patrick L Sr Brown | — | Installer (Class II)Inspector (Maintenance Provider) | OS0034387 |
| Tommy R Dulworth | — | Installer (Class II)Inspector (Maintenance Provider) | OS0024074 |
| Trevon R Dulworth | — | Installer (Class II)Designer (Site Evaluator) | OS0033982 |
| William Wayne Rs Hill | — | Designer (Site Evaluator) | OS0007622 |
20 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Navarro County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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