Class D Ready

Pass the Texas Class D water operator exam

Practice questions written from the TCEQ rules themselves, with the rule behind every answer and the water math worked out step by step.

Take the free 20-question test See the full course, $79
  • TCEQ exams take 70% to pass
  • 264 practice questions
  • Pass guarantee

Try one

According to TCEQ rules, how often must all dead-end mains be flushed?

Free Class D practice test

Twenty questions across the areas TCEQ lists for Class D: rules, drinking water standards, safety, disinfection, sampling, groundwater, surface water, distribution, and math. You'll see the answer and its source after each question, then a breakdown of where to focus.

What the full course does for you

Shows you exactly where you're weak
A readiness score for each Class D area, so you study what you'll miss, not what you already know.
Backs every answer with the rule
264 questions written from 30 TAC Chapters 290 and 30 and OSHA safety standards. When you get one wrong, you see the rule and why.
Makes the math automatic
Tank volumes, chlorine feed, hypochlorite, residuals, and conversions, with fresh numbers every time and each step worked out.
Gets you used to exam conditions
Timed 50-question practice exams from every area, with every missed question explained at the end.
An example of the readiness screen in the course. Lighter swatches show the areas to study next.

Class D Ready full course

$79 one payment, 180 days of access

Less than the $111 TCEQ charges just to apply for the license.

  • 264 practice questions across every Class D area
  • 240 water-math problems with every step shown
  • Timed 50-question practice exams
  • Readiness score for each area
  • The rule behind every answer
  • Works on your phone or computer, starting right after checkout
Get the full course for $79

Pass guarantee. Finish the course and don't pass? Get your money back.

14-day refund. Not for you? Email us for a full refund.

Employer paying? Your receipt works for reimbursement. Already bought? Open your course.

Questions

Is this from TCEQ?

No. Class D Ready is independent and isn't affiliated with or endorsed by the Texas Commission on Environmental Quality. The questions are written from TCEQ's published need-to-know criteria and rules, not from real exams.

What's the difference between the free test and the full course?

The free test is 20 questions, one pass. The full course has 264 questions plus 240 math problems, practice by area, timed practice exams, readiness scores, a review of everything you've missed, and the pass guarantee.

Where do the answers come from?

Each rule question is written from the text of 30 Texas Administrative Code Chapters 290 and 30, or OSHA safety standards, and shows the exact rule it comes from. Every question is checked against that rule before it's published, and math answers are calculated, not looked up. Every question has a "report a problem" link, and corrections go out within a few days.

How does the pass guarantee work?

Answer at least 90% of the practice questions (water math doesn't count, since it's unlimited) and complete two timed practice exams before your exam date. The course tracks both for you. If you don't pass, email us your result within 30 days of the exam for a full refund.

Can I use it on more than one device?

Yes. After checkout you'll get an access link to bookmark, and you can restore access on any device with your checkout email and your receipt number (or your card's last 4 digits). Progress is saved on each device.

Can my employer pay for it?

Yes. You'll get a receipt you can submit for reimbursement. For a crew, email [email protected].

What about Class C?

Class D comes first. Class C distribution and groundwater are planned next.