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What is a Class D wastewater operator?
A Class D wastewater operator holds the entry-level Texas license to work at a wastewater collection or treatment system. It requires no prior experience, is earned by completing an approved training course and passing a closed-book exam, and is the first grade on the path to Class C, B, and A.
Last reviewed 2026-08-03
What the license covers
It qualifies you for entry-level operator work at a wastewater system: the collection lines, treatment process, and disinfection that clean used water before it returns to the environment.
Where it leads
Class D is the first of four wastewater grades. With documented experience and higher exams you move up to Class C, B, and A, at larger plants and higher pay.
Common questions
- Is it the entry-level license?
- Yes, it is the first Texas wastewater operator grade.
- Do I need experience?
- No prior experience is required for Class D.
- Is it the same as a water license?
- No. Water and wastewater are separate Texas licenses.