| Company | Location | Certifications | License # |
|---|---|---|---|
| Aaron S Giacobbi | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0035111 |
| Alice E Perryman | — | Installer (Class I) | OS0039554 |
| Billy C Hopson | — | Designer (Site Evaluator) | OS0018596 |
| Chad Eric Couch | — | Installer (Class II)Designer (Site Evaluator) | OS0036971 |
| Charles Brent Gilmore | — | Installer (Class I)Designer (Site Evaluator) | OS0034796 |
| Chase Massingill | — | Installer (Class I) | OS0039740 |
| Chris L Gribble | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0034634 |
| Clay S Marwitz | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0035112 |
| Clayton Roy Mclaughlin | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0040325 |
| Cody Wilson Richardson | — | Installer (Class I) | OS0038849 |
| Dale S Rueter | — | Installer (Class I) | OS0028191 |
| Dylan Blake White | — | Installer (Class II) | OS0040637 |
| Fahron Dane Nolte | — | Installer (Class II)Inspector (Maintenance Provider) | OS0036410 |
| Faye Lynn Jones | — | Installer (Class II)Designer (Site Evaluator) | OS0038483 |
| Frank Daniel Loya | — | Installer (Class I) | OS0035436 |
| Gary Don Gribble | — | Installer (Class II)Designer (Site Evaluator) | OS0006056 |
| Gilbert K Miller | — | Inspector (Maintenance Provider) | MP0002713 |
| Joby D Mooney | — | Installer (Class II) | OS0027920 |
| Justin Lyle Mannix | — | Designer (Site Evaluator) | OS0037228 |
| Kenneth A Mclaughlin | — | Installer (Class II) | OS0035164 |
| Marcy H Pitts | — | Inspector (Maintenance Provider) | MP0000944 |
| Michael F Dutschmann | — | Installer (Class II)Designer (Site Evaluator) | OS0029413 |
| Michael W Perryman | — | Installer (Class II)Inspector (Maintenance Provider) | OS0035767 |
| Norman C Gohlke | — | Installer (Class II)Designer (Site Evaluator) | OS0035025 |
| Paul Craig Ashmore | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0006188 |
| Timmy Ralph Sohns | — | Installer (Class II)Designer (Site Evaluator) | OS0001275 |
| Timothy B Pitts | — | Installer (Class II)Inspector (Maintenance Provider) | OS0019409 |
| Tully Meyer | — | Installer (Class II) | OS0039602 |
| Utah Michael Dutschmann | — | Installer (Class I) | OS0040679 |
| Zackary L Rose | — | Installer (Class II)Designer (Site Evaluator) | OS0026230 |
30 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Coryell County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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