| Company | Location | Certifications | License # |
|---|---|---|---|
| Andrew F Denaker | — | Designer (Site Evaluator) | OS0039312 |
| Bobby Jackson | — | Installer (Class II)Inspector (Maintenance Provider) | OS0040025 |
| Charles C Bowen | — | Installer (Class II)Inspector (Maintenance Provider) | OS0028772 |
| Christopher Robert Gracy | — | Installer (Class II)Inspector (Maintenance Provider) | OS0008958 |
| Craig A Pettit | — | Installer (Class II)Inspector (Maintenance Provider) | OS0034789 |
| Devon C Boudreau | — | Installer (Class II) | OS0039399 |
| Donny G Sadler | — | Installer (Class II) | OS0019865 |
| Frank A Powell | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0027255 |
| Howard S Smith | — | Installer (Class II)Inspector (Maintenance Provider) | OS0032420 |
| Hunter Lord | — | Installer (Class I) | OS0040965 |
| James C Rivas | — | Installer (Class II)Inspector (Maintenance Provider) | OS0032315 |
| James Rickey Jr Fortner | — | Installer (Class II)Inspector (Maintenance Provider) | OS0008220 |
| Jay Geng | — | Installer (Class II) | OS0038525 |
| Jeffery T Hollomon | — | Installer (Class II)Inspector (Maintenance Provider) | OS0032802 |
| Jody Beaver | — | Inspector (Maintenance Provider) | MP0000062 |
| John H Harris | — | Designer (Site Evaluator) | OS0039834 |
| Jonathan S Davis | — | Installer (Class II)Inspector (Maintenance Provider) | OS0034246 |
| Jose Cruz Nolasco | — | Inspector (Maintenance Provider) | MP0001231 |
| Jose J Jr Barron | — | Installer (Class II)Inspector (Maintenance Provider) | OS0034277 |
| Joseph Wofford | — | Installer (Class I) | OS0041550 |
| Juan Gerardo Santana | — | Inspector (Maintenance Provider) | MP0000033 |
| Larry Don Rs Howard | — | Designer (Site Evaluator) | OS0012103 |
| Mackie D Gourley | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0034361 |
| Marcus W Tidwell | — | Installer (Class II)Inspector (Maintenance Provider) | OS0028761 |
| Michael G Arms | — | Installer (Class II)Inspector (Maintenance Provider) | OS0005516 |
| Misty Lynn Brown | — | Designer (Site Evaluator) | OS0011183 |
| Myra Barron Ruiz | — | Designer (Site Evaluator) | OS0033931 |
| Raymond T Harris | — | Inspector (Maintenance Provider) | MP0002652 |
| Rodrigo M Garcia | — | Inspector (Maintenance Provider) | MP0000053 |
| Roy Dell Dickerson | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0000536 |
| Ruben Fraire | — | Installer (Class II) | OS0038986 |
| Ryan C Conger | — | Installer (Class II) | OS0034503 |
| Terry W Tidwell | — | Installer (Class II)Inspector (Maintenance Provider) | OS0005076 |
| Thomas A Vyles | — | Designer (Site Evaluator) | OS0035933 |
| Tom Wallis Airhart | — | Installer (Class I) | OS0040507 |
| William Dehaan | — | Installer (Class I) | OS0040134 |
36 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Collin County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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