| Company | Location | Certifications | License # |
|---|---|---|---|
| Andrew R Mccaffety | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0033977 |
| Ashley Bonds | — | Installer (Class II)Inspector (Maintenance Provider) | OS0035287 |
| Bradley J Bonds | — | Installer (Class II) | OS0031443 |
| Brian Todd Lucherk | — | Installer (Class II) | OS0004420 |
| Cody S Young | — | Installer (Class II) | OS0038494 |
| Cory Micheal Bonds | — | Inspector (Maintenance Provider) | MP0002849 |
| David Jasper Preston | — | Installer (Class I) | OS0037673 |
| Erik Jorgensen-Tjornehoj | — | Installer (Class II)Designer (Site Evaluator) | OS0038581 |
| Federico Jr Gonzales | — | Installer (Class II) | OS0030092 |
| Glen Ray Ii Bonds | — | Installer (Class II)Inspector (Maintenance Provider) | OS0003045 |
| Jerry W Gallier | — | Installer (Class II)Inspector (Maintenance Provider) | OS0033487 |
| John S Frank | — | Installer (Class II) | OS0027824 |
| Jose Juan Esquivel | — | Installer (Class II)Designer (Site Evaluator) | OS0037661 |
| Jose Mata | — | Installer (Class II) | OS0040823 |
| Kevin Douglas Seawright | — | Inspector (Maintenance Provider) | MP0002643 |
| Luis Daniel Perez | — | Installer (Class I) | OS0039847 |
| Manoa G Dominguez | — | Inspector (Maintenance Provider) | MP0002355 |
| Mark D Smith | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0008056 |
| Marshall Moody Love | — | Installer (Class I)Inspector (Maintenance Provider) | OS0034830 |
| Maximo Jr Lopez | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0034790 |
| Ricky Lynn Bonds | — | Installer (Class II)Inspector (Maintenance Provider) | OS0003046 |
| Robert Earl Jr Wade | — | Installer (Class II) | OS0003524 |
| Starsky T Wallin | — | Installer (Class II)Inspector (Maintenance Provider) | OS0039601 |
| Steven L Harrelson | — | Installer (Class II)Designer (Site Evaluator) | OS0036308 |
| Steven W Welsh | — | Installer (Class II)Designer (Site Evaluator) | OS0035490 |
| Terrance Michael Thibodeaux | — | Inspector (Maintenance Provider) | MP0001122 |
| Terry E Harrison | — | Installer (Class II) | OS0006058 |
| Terry S Hunsucker | — | Installer (Class II) | OS0037166 |
| Vicente Esquivel | — | Installer (Class II) | OS0039271 |
| William C Harrison | — | Installer (Class II)Inspector (Maintenance Provider) | OS0032407 |
| William Henry Welsh | — | Installer (Class II) | OS0009021 |
31 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Waller County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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