About
Built to be trusted, not just to sell
Water Operator Exam Prep helps a working operator, trainee, or career changer prepare for one exact certification exam. Today that is the Texas Class D water and wastewater operator exams. The goal is simple: answer the question you actually have after a shift, which is what to study next for your exam, without wasting your time on the wrong material.
The standards we hold
Original questions, reviewed before they serve
Every practice question is written from scratch and read by a licensed Texas operator before any candidate sees it. We never use recalled, leaked, or memorized exam questions, and we never reproduce protected exam material.
Every fact traces to an official source
Requirements, fees, courses, and rules link to the exact TCEQ page they came from, with the date we last checked them. If a source changes, the fact stops showing until we re-verify it.
Scoped to your exact exam
We build for one exam at a time: Texas Class D water or Texas Class D wastewater. Higher-grade material is left out on purpose, so you spend your time only on what your exam actually tests.
Honest about outcomes
We never promise a pass and we never claim to know your result ahead of time. No tool can honestly do either. What we can do is show you what to study next and why, with the work shown.
Math you can trust
Every calculation is worked one step at a time, and each answer is independently re-derived by code before it ships. No number is a mystery, and each constant is named and sourced.
Free to start, nothing hidden
The practice and the calculators need no account. We are plain about what is free, what is paid, and what is still in review, because trust is the whole point of an honest study tool.
Independent, and clear about it
We are not affiliated with the Texas Commission on Environmental Quality or any testing vendor. The official word on any requirement always comes from the TCEQ sources we link on every page. Where the reviewed question bank is still in review, we say so plainly rather than serve anything a licensed operator has not signed off on.