About Operator Master
Built for Wastewater Operators.
Operator Master is a free study tool for wastewater certification review, practical math, and clearer technical vocabulary, built by a working wastewater operator.
Who builds it
A working wastewater operator who holds a Washington Group III certificate and has about 13 years in wastewater treatment. The questions, math and courses come from the plant floor, and anything we can't source stays out.
What it provides
Original practice questions, explanations, math help, and definitions designed for studying—not copied exam questions.
How it is built
Content is organized by certification level and reviewed against available operator-training sources and published exam guidance.
What it is not
Operator Master is independent. It is not an official examination, licensing authority, regulator, or guarantee of a passing score.
Meet Klok
Klok is the Operator Master mascot, the operator in the hard hat and goggles. He shows up throughout the app to welcome you and keep you moving through your practice.
Last updated September 25, 2026.
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