Arizona Plumbing Practice Exam 2026 – Complete Preparation Guide

The maximum height for a backflow prevention device installation is specified as 12 inches above the highest water outlet served. This guideline is important because it ensures that the backflow prevention device operates effectively, preventing back siphonage or back pressure from contaminating the potable water supply. Installing the device too high can reduce its effectiveness and lead to violations of plumbing codes, which could expose the system to potential contamination.

When a backflow prevention device is positioned at the recommended height, it allows for proper pressure dynamics and minimizes the risk of backflow occurring, thus maintaining the integrity of the drinking water system. Ensuring compliance with this height requirement is critical for both safety and regulatory adherence in plumbing installations.