| Company | Location | Certifications | License # |
|---|---|---|---|
| Alan J Vincik | — | Installer (Class II)Designer (Site Evaluator) | OS0000827 |
| Alan Lemke | — | Installer (Class I) | OS0040406 |
| Angel Mesta | — | Installer (Class I) | OS0039589 |
| Aurelio Rosas Montes | — | Installer (Class II) | OS0005118 |
| Barton B Simpson | — | Installer (Class II)Inspector (Maintenance Provider) | OS0029838 |
| Berry B Iii Blackstock | — | Installer (Class II) | OS0034522 |
| Blake Sudderth | — | Installer (Class II) | OS0005935 |
| Bobby G Barnard | — | Installer (Class II) | OS0029540 |
| Brandon L Rs Couch | — | Designer (Site Evaluator) | OS0008636 |
| Brian D Wall | — | Installer (Class II) | OS0025929 |
| Brian K Byrn | — | Installer (Class II) | OS0003075 |
| Brittany Nicole Bearden | — | Installer (Class II) | OS0037109 |
| Bryan I Klepzig | — | Installer (Class II)Inspector (Maintenance Provider) | OS0031088 |
| Caleb D Hinojosa | — | Installer (Class I) | OS0038183 |
| Cameron Perrin Rs Smiley | — | Installer (Class II)Designer (Site Evaluator) | OS0004290 |
| Casey Lawrence Rodenbaugh | — | Designer (Site Evaluator) | OS0035310 |
| Chad C Winkler | — | Designer (Site Evaluator) | OS0028982 |
| Charles W Foreman | — | Installer (Class I)Inspector (Maintenance Provider) | OS0026765 |
| Chester D Tutor | — | Installer (Class I) | OS0019974 |
| Christopher L Bennett | — | Inspector (Maintenance Provider) | MP0002054 |
| Christopher Wade Schneider | — | Installer (Class II) | OS0006836 |
| Daniel Montes | — | Installer (Class II)Inspector (Maintenance Provider) | OS0037286 |
| Daniel R Tatum | — | Inspector (Maintenance Provider) | MP0002290 |
| Daryl A Klepzig | — | Installer (Class II) | OS0005095 |
| Daryl W Guess | — | Installer (Class II) | OS0001655 |
| Douglas Earl Mcpeters | — | Designer (Site Evaluator) | OS0019786 |
| Eric Kasmire | — | Installer (Class I) | OS0040849 |
| Gary W Kovar | — | Installer (Class II) | OS0001670 |
| Gerry James Ii Repa | — | Installer (Class II)Designer (Site Evaluator) | OS0003058 |
| Gwendolyn B Meighan | — | Designer (Site Evaluator) | OS0009458 |
| Henry Hardeman Roberts | — | Installer (Class I)Designer (Site Evaluator) | OS0029810 |
| Herndon Brandon Bailey | — | Installer (Class I) | OS0039284 |
| Heston Luersen | — | Installer (Class I) | OS0041184 |
| Jack W Ward | — | Installer (Class II) | OS0001711 |
| James Dee Rampy | — | Installer (Class II) | OS0031148 |
| James E Rampy | — | Installer (Class II) | OS0001690 |
| James L Lancaster | — | Designer (Site Evaluator) | OS0033972 |
| Jason C Fuentes | — | Installer (Class I) | OS0034013 |
| Jason D Elkins | — | Installer (Class I) | OS0032188 |
| Jason G Rs Clark | — | Installer (Class II)Designer (Site Evaluator) | OS0022917 |
| Jesse J Threet | — | Installer (Class II)Inspector (Maintenance Provider) | OS0029934 |
| Jessica A Ward | — | Installer (Class II) | OS0037595 |
| Jesus Alcala | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0035453 |
| Johan Frederik Wissing | — | Installer (Class I) | OS0040440 |
| John A Nelson | — | Designer (Site Evaluator) | OS0033975 |
| John E Schwertner | — | Installer (Class II) | OS0003678 |
| John Lee Williamson | — | Installer (Class I) | OS0034290 |
| John Paul New | — | Installer (Class II)Inspector (Maintenance Provider) | OS0034272 |
| Johnny Ojeda Montes | — | Installer (Class I) | OS0037524 |
| Josue I Rabadan | — | Installer (Class II) | OS0036705 |
| Juan P Chairez | — | Inspector (Maintenance Provider) | MP0002227 |
| Justin Kyle Amyx | — | Installer (Class II)Inspector (Maintenance Provider) | OS0027912 |
| Justin S Blanton | — | Installer (Class I) | OS0037588 |
| Kara E Wardwell | — | Designer (Site Evaluator) | OS0040643 |
| Keith R Kimbro | — | Installer (Class I) | OS0033442 |
| Kelli Dodd | — | Installer (Class I) | OS0041348 |
| Kent B Knight | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0035707 |
| Kierstin Thompson | — | Installer (Class I) | OS0041197 |
| Leslie Ray Moore | — | Installer (Class II) | OS0007527 |
| Logan Grea Williams | — | Installer (Class I) | OS0040549 |
| Logan Wright | — | Installer (Class I) | OS0039858 |
| Louis W Jr Knapek | — | Designer (Site Evaluator) | OS0038112 |
| Luis Alberto Cruz | — | Installer (Class I) | OS0040675 |
| Mack A Holland | — | Installer (Class II)Inspector (Maintenance Provider) | OS0006213 |
| Mark C Stoops | — | Inspector (Maintenance Provider) | MP0002125 |
| Mark W Sr Griffor | — | Installer (Class II) | OS0031797 |
| Michael Aaron Bernstein | — | Installer (Class I) | OS0040021 |
| Michael J Heeney | — | Installer (Class II) | OS0037208 |
| Michael J Murphy | — | Installer (Class II)Inspector (Maintenance Provider) | OS0019861 |
| Michael Jack Level | — | Installer (Class II)Inspector (Maintenance Provider) | OS0036028 |
| Michael Lee | — | Installer (Class I) | OS0040174 |
| Michael S Snowden | — | Installer (Class II)Inspector (Maintenance Provider) | OS0028074 |
| Mitchell David Scorza | — | Designer (Site Evaluator) | OS0040976 |
| Nathan J Mendez | — | Installer (Class II)Inspector (Maintenance Provider) | OS0033828 |
| Nathan L Wilson | — | Installer (Class II) | OS0029564 |
| Nicolas D Filer | — | Installer (Class I) | OS0040661 |
| Oscar A Gutierrez | — | Installer (Class I) | OS0039415 |
| Paul R Kaiser | — | Designer (Site Evaluator) | OS0031949 |
| Paul T Walter | — | Designer (Site Evaluator) | OS0009571 |
| Randy L Minzenmayer | — | Installer (Class II) | OS0001675 |
| Richard E Price | — | Designer (Site Evaluator) | OS0009312 |
| Ricky Brandon Sparkman | — | Installer (Class II)Designer (Site Evaluator) | OS0001773 |
| Ricky Montes | — | Installer (Class II)Inspector (Maintenance Provider) | OS0036832 |
| Robert E Jenkins | — | Installer (Class II)Inspector (Maintenance Provider) | OS0002673 |
| Robert Julius Taubert | — | Installer (Class I) | OS0037130 |
| Robert W Little | — | Installer (Class I) | OS0041123 |
| Rodney P Threet | — | Installer (Class II) | OS0029940 |
| Rodolfo C Deras | — | Installer (Class II)Inspector (Maintenance Provider) | OS0038659 |
| Russell Pack Moore | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0037821 |
| Sam I Thomas | — | Designer (Site Evaluator) | OS0027622 |
| Thomas A Daly | — | Designer (Site Evaluator) | OS0032974 |
| Thomas David Reynolds | — | Installer (Class II) | OS0008076 |
| Thomas Worth Sandifer | — | Installer (Class II) | OS0004503 |
| Timothy W Bobbitt | — | Installer (Class II) | OS0035427 |
| Trent C Hogan | — | Installer (Class II) | OS0032815 |
| Tyson Kyle Poindexter | — | Installer (Class II) | OS0037121 |
| Weldon R Couch | — | Installer (Class II) | OS0029050 |
| William Craig Albert | — | Installer (Class I) | OS0038231 |
| Willie Sualua Tupolo | — | Installer (Class I) | OS0039431 |
99 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Williamson County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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