Guides
- How we check our questions
How we check OperadorListo’s practice questions: a public source for each one, a separate check and a blind sample. - How to get the license
A high school diploma or GED, two TCEQ-approved courses, the application with its $111 fee, and a passing exam score. No work experience. The steps. - TCEQ pass rates
In 2024, 38% of Class D water exam sittings in Texas passed: 1,502 of 3,968. TCEQ pass rates by exam, each with its source.
Free tools
- Take the free check
Answer 10 practice questions and see your score by subject. No account and no email. - Flow calculator: gpm and MGD
Free calculator to practice changing gpm to MGD and MGD to gpm for the water operator exam. - Chlorine pounds per day calculator
Free calculator to practice the pounds-per-day formula for the water operator exam: flow in MGD or gpm, dose in mg/L, step by step. - Detention time calculator (Class C)
Free calculator to practice detention time, a topic of the Class C water operator exams, step by step. - Round tank gallons calculator
Free calculator to practice a round tank's volume in gallons for the water operator exam, step by step.