Book updated Oct. 2020. In AZ, ADEQ's Operator Certification Program establishes guidelines to ensure that only certified operators can be in direct charge of the water distribution systems. There are multiple exam grades. The questions provided in this product focus on the fundamental water distribution knowledge compatible with all exam grades. We create these self-practice test questions module referencing the principles and concepts currently valid in the water distribution exams. Each question comes with an answer and a short explanation which aids you in seeking further study information. For purpose of exam readiness drilling, this product includes questions that have varying numbers of choices. Some have 2 while some have 5 or 6. We want to make sure these questions are tough enough to really test your readiness and draw your focus to the weak areas. You should use this product together with other study resources for the best possible exam prep coverage.