| Company | Location | Certifications | License # |
|---|---|---|---|
| Adelfo Carbajal | — | Installer (Class I) | OS0039803 |
| Anna M Lowe | — | Installer (Class II) | OS0038473 |
| Armando Figueroa | — | Installer (Class I) | OS0039758 |
| Cameron C Adams | — | Installer (Class II)Inspector (Maintenance Provider) | OS0031792 |
| Clifford James Rs Conner | — | Designer (Site Evaluator) | OS0007431 |
| Daniel P Graham | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0037814 |
| David Murray | — | Installer (Class II)Inspector (Maintenance Provider) | OS0040367 |
| David Paul Johnson | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0005047 |
| David Paul Jr Johnson | — | Installer (Class II)Inspector (Maintenance Provider) | OS0008737 |
| Erik Lee Cervantes | — | Installer (Class I) | OS0038878 |
| Forrest C Nevill | — | Installer (Class II)Inspector (Maintenance Provider) | OS0004799 |
| Genaro Henry Guerrero | — | Installer (Class II) | OS0028139 |
| Guadalupe Jr Ruiz | — | Installer (Class I) | OS0030350 |
| Guy Kirk Smarr | — | Installer (Class II) | OS0038422 |
| Jack Wayne Bell | — | Installer (Class I) | OS0039154 |
| Jesus Barrientos-Diaz | — | Installer (Class I) | OS0039930 |
| Joe A Gonzales | — | Installer (Class II)Inspector (Maintenance Provider) | OS0040360 |
| John C Foster | — | Inspector (Maintenance Provider) | MP0002229 |
| John S Foster | — | Installer (Class II) | OS0036694 |
| Jose Bertoldo Jaimes | — | Installer (Class II) | OS0030176 |
| Julia L Spiller | — | Installer (Class II)Designer (Site Evaluator) | OS0004261 |
| Mark S Rs Duke | — | Installer (Class II) | OS0005424 |
| Matthew Carter | — | Installer (Class II)Inspector (Maintenance Provider) | OS0037662 |
| Molly L Guerrero | — | Inspector (Maintenance Provider) | MP0001525 |
| Patrick Russell Hellums | — | Installer (Class II)Inspector (Maintenance Provider) | OS0038855 |
| Rene Valenzuela | — | Inspector (Maintenance Provider) | MP0002403 |
| Scott A Patterson | — | Installer (Class I) | OS0028501 |
| Weston E Stephens | — | Installer (Class I) | OS0040799 |
28 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Caldwell County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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