Operator Master

Operator Master

About this app

Operator Master helps water and wastewater operators get ready for their certification exams.

• Answer Questions: mixed practice questions with a clear explanation after each answer.
• Math: wastewater calculations broken into steps, with pictures of the given values.
• Practice test: a timed, exam-style test that hides help until you finish.
• Ask Klok: missed a question? Tap Klok for an explanation, or ask about a process, a piece of equipment or a math problem. Sign-in required; 5 free answers.
• Glossary terms and pictures, formula help, and a free math course.
• Daily goal and streak to keep you studying.
• Works without an account; sign in with Google or Apple to save progress across devices.

Levels follow the state you choose. Operator Master is an independent study tool and is not affiliated with or endorsed by WPI, PSI, ABC, the Washington State Department of Ecology or any other certification authority. It does not reproduce live or confidential exam questions, guarantee a passing score, or replace current regulations, approved references, facility procedures or qualified professional judgment.

What’s new

First Android release.