| Company | Location | Certifications | License # |
|---|---|---|---|
| John W Taylor | — | Installer (Class II) | OS0003399 |
| Patrick Joseph Bullard | — | Installer (Class II)Inspector (Maintenance Provider) | OS0023921 |
| Rebecca Young | — | Installer (Class I) | OS0038227 |
| Sandra J Erb | — | Installer (Class II)Designer (Site Evaluator)Inspector (Maintenance Provider) | OS0027816 |
4 companies in the TCEQ OSSF (On-Site Sewage Facility) occupational licenses are based in Madison County as of 2026-07-23. Companies based elsewhere in Texas also commonly serve the county.
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