| Company | Location | Certifications | License # |
|---|---|---|---|
| Alejandro Serrato | — | Installer (Class I) | OS0040988 |
| Billy Dale Husband | — | Installer (Class II)Inspector (Maintenance Provider) | OS0001816 |
| Brittany Marie Capps | — | Inspector (Maintenance Provider) | MP0002500 |
| Charles Oscar Bell | — | Installer (Class I) | OS0040263 |
| Chase Wayne Capps | — | Installer (Class I) | OS0038265 |
| Coy Austin Elliott | — | Installer (Class I) | OS0041459 |
| Darin L Daniels | — | Installer (Class II)Designer (Site Evaluator) | OS0026706 |
| Frank W Iii Allen | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0006558 |
| John Wesley Rs Hubert | — | Designer (Site Evaluator) | OS0011687 |
| Justin A Weihrich | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0027269 |
| Justin Edward Delgadillo | — | Installer (Class II) | OS0040448 |
| Karolyn Johnson | — | Installer (Class I) | OS0040985 |
| Kenneth A Butts | — | Installer (Class II) | OS0029543 |
| Kenneth Wayne Mock | — | Installer (Class II)Inspector (Maintenance Provider) | OS0035881 |
| Mitchell Kraus | — | Installer (Class I) | OS0039903 |
| Mysti N Thornton | — | Designer (Site Evaluator) | OS0031938 |
| Natalie Renberg | — | Inspector (Maintenance Provider) | MP0002449 |
| Noah Lane Deatley | — | Inspector (Maintenance Provider) | MP0002775 |
| Paul Michael Condon | — | Installer (Class II) | OS0004136 |
| Peter R Giacona | — | Inspector (Maintenance Provider) | MP0001983 |
| Richard Jay Porter | — | Installer (Class II)Inspector (Maintenance Provider) | OS0030531 |
| Richard M Terry | — | Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0036074 |
| Robert L Allen | — | Installer (Class II)Designer (Site Evaluator) | OS0030932 |
| Stacy B Rs Wright | — | Designer (Site Evaluator) | OS0034586 |
| Steven L Thornton | — | Designer (Site Evaluator) | OS0035003 |
| Thomas E Hayes | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0027520 |
| Tim W Kuta | — | Installer (Class II) | OS0003195 |
| Timothy A Butts | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0036663 |
| William Reed | — | Installer (Class I) | OS0038516 |
| Zane Blaise Moriarty | — | Installer (Class I) | OS0041302 |
30 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Grimes County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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