The purpose of the Mastery exam is to ensure that certified operators have the mastery skills in drinking water and wastewater systems.  The mastery exam is given online with supervision by a GateWay proctor at either the GateWay campus testing center or off-campus locations throughout Arizona.  

The mastery exams are broken out into four areas: Water Treatment, Wastewater Treatment, Collection and Distribution. You will need to talk with your supervisor to determine which of the four areas to pursue.  Further, each area is then broken into four grade levels, with grade 1 being the entry level that must be taken first.  

You will be given up to 110 questions online with three hours to complete.  Ten (10) of the questions are called PRE-TEST questions because ABC is testing them to see if they are good questions for future exams.  Although you will not know which the extra questions are, they will not be included in your score.  Only 100 questions are scored.  You will be emailed a copy of your exam score, which is called your Individual Mastery Report (IMR).   

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Exams are based on the 2017 ABC Edition, and it is advised that you study the type of material found in the Need to Know section HERE.

You can also download the conversion tables used at the exam so you can familiarize yourself with them ahead of time. However, you cannot take them to the exam. GateWay will provide them to you at the testing site. 

You may contact ADEQ for practice exams, as follows: 602-771-0100 or azopcert@azdeq.gov 

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Once you pass your test, you will need to submit your Individual Mastery Report (IMR), which will be emailed to you following your test, along with an application and fee to the ADEQ portal located HERE.