California T5 Water Treatment Operator Practice Test
Practice for the California SWRCB Division of Drinking Water (DDW) T5 Water Treatment Operator certification — the highest treatment-operator grade for California's largest, most complex systems. Covers California-specific regulations (Title 22 CCR, hexavalent chromium, PFAS Notification and Response Levels), Direct and Indirect Potable Reuse (CA leads the nation), drought and conservation frameworks, advanced treatment (membranes, AOP), and large-system operations management. Calibrated to California DDW Drinking Water Treatment Exam Expected Range of Knowledge rev. April 2020.
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Browse all testsBoth options pull from the same 61-question bank. The quick quiz randomly selects 25 questions each time you take it.
California T5 Water Treatment Operator Practice Test
About this practice test
This California T5 Water Treatment Operator Practice Test practice test is a free study tool for water operators preparing for state and national certification exams. The 61 questions on this exam cover the most common topics tested at this level, and every question comes with a plain-English explanation so you can actually learn the material.
If you're studying for the certification exam, we recommend taking this test once, reviewing the explanations for any questions you missed, and then taking it again later. You can also explore the other practice tests covering specific topics like disinfection, filtration, and operator math. If you want a structured walk-through of what to study and in what order, see our 30-day study plan.