California water treatment practice test
Practice questions for the T1 and T2 treatment operator exams, written from the State Water Board range of knowledge and explained one by one. Train by topic, then take a timed 100 question mock exam.
- All 223 questions and answers
- Free practice test
- Money-back guarantee
Take the practice test
10 practice questions from the question catalog. How many can you get right?
How California water operator certification works
Water treatment operators in California need a certificate from the State Water Resources Control Board. You apply to the Board, take the exam at a Prometric test center and then apply for the certificate.
The T1 and T2 exams have 100 multiple choice questions each, split across source water, treatment processes, operation and maintenance, laboratory procedures and regulations. An equivalents and formula sheet is provided for the math.
This site is an independent exam trainer. The certificate itself is issued by the State Water Board, not by us. We also have practice tests for distribution and wastewater operators.
The topics of the test
The 223 questions in the catalog are spread across these areas. In the trainer you practice all of them until every area sticks.
- Source Water39 questions
- Water Treatment Processes49 questions
- Operation and Maintenance36 questions
- Laboratory Procedures26 questions
- Regulations and Administrative Duties31 questions
- Treatment Exam Math42 questions
How many questions can you get right?
10 practice questions, free and without signing up. At the end you see whether it would already be enough for the test.
How you learn with us
No rote memorizing from start to finish. The trainer remembers what you know and practices exactly the rest with you.
Take the practice test
10 practice questions, free. Afterwards you know where you stand.
All questions with solutions
The complete catalog with 223 questions, each with the correct answer.
Tests that adapt to you
Every round puts the questions together anew. Whatever you got wrong comes back until it sticks.
Pass or get your money back
If you fail despite practicing, you get your last payment back.
All questions and answers in the online trainer
Everything you need for the knowledge test in one place. No book, no class, on your phone or computer.
- 223 questionsAll with solutions
- 100 in 180 minutesLike in the real test
- 6 topic areasPractice targeted, one by one
- 100 %Money-back guarantee
The complete question catalog
All 223 questions that could come up, each with the correct answer. You learn exactly what gets asked.
For every question you see how often others get it wrong and which answer they mix it up with. That way you spot the traps.
Test simulation like the real thing
100 questions, 180 minutes, graded like the real test: at least 70 correct answers out of 100 (70 percent, our practice target).
Every round is shuffled anew. Afterwards you see right away whether you would have passed and what is still missing.
Practice that adapts to you
The trainer remembers what you already know. Wrong answers come back until they stick, and a question only counts as learned once you have answered it correctly several times with time in between.
You can also practice individual topics or just your weak spots.
Your plan until the test
Enter your test date and the trainer spreads the questions across the remaining days. That way a small round waits for you every day instead of cramming everything the last evening.
Your progress shows you at any time when you are ready for the test.
Short videos to swipe
Learn like on Instagram or TikTok: Every question comes as a short video, you tap your answer and swipe to the next one. Whatever you got wrong shows up more often.
Ideal for in between, on the train or on a break.
Pricing
Both options include all questions and answers and all trainer features. You only decide whether you pay weekly or once.
Weekly pass
$7.99per week
- All 223 questions and answers
- All trainer features
- Cancel anytime
Permanent access
$39.99one-time
- All 223 questions and answers
- All trainer features
- Pay once, no subscription
Our money-back guarantee applies to the subscription.
back
guarantee
Our money-back guarantee
We are confident that you will pass with the trainer. If not, we refund the last payment of your subscription. The guarantee applies to the subscription, not to lifetime access.
It is that simple: Within 30 days after the test, send us a short email at [email protected] with proof, for example a photo of your test result. No follow-up questions, no form. The exact conditions are in the terms and conditions.
Frequently asked questions
What do I need for the T1 exam?
A high school diploma or GED, or one of the equivalents the State Water Board accepts. T2 also requires a 36 hour water treatment course. Check the Board pages for the current rules and fees.
How many questions are on the exam?
100 multiple choice questions. The range of knowledge weights source water and treatment processes at 25 percent each, operation and maintenance at 20, laboratory and regulations at 15 each.
Are these the real exam questions?
No. The State Water Board does not publish its exam questions. All questions here are our own, written from the official range of knowledge.
Do I get my certificate here?
No. This site only helps you prepare. Certificates are issued by the State Water Resources Control Board after you pass the exam. We are not affiliated with the Board or Prometric.
Do you cover distribution and wastewater too?
Yes. Use the menu to switch to the distribution (D1, D2) or wastewater (Grade I, II) practice tests. One purchase unlocks all three.