Answered
How long is the Texas Class D exam?
You get 3 hours for the Texas Class D exam. The TCEQ states that all computer-based occupational exams have a 3-hour time limit unless otherwise noted, and the Class D water and wastewater exams are not among the noted exceptions. Most operators finish well inside that window.
Last reviewed 2026-08-03
The time you get
The TCEQ sets a 3-hour limit for its computer-based occupational exams unless a specific exam is noted otherwise. Only a few exams (such as Class A wastewater and landscape irrigator) carry a longer limit; Class D is not one of them, so you have the standard 3 hours.
You will not need all of it
Three hours is generous for a Class D exam. The pressure is knowing the material, not racing the clock, so use the time to read each question carefully and check your math rather than rushing.
Common questions
- How long is the Class D exam?
- 3 hours.
- Is the wastewater exam the same length?
- Yes. The 3-hour default applies to both Class D water and wastewater.
- Do most people use the full time?
- No. Three hours is generous for the Class D exam; most finish with time to spare.