Backflow Prevention Practice Exam

What is the potential hazard of a double check valve assembly if not properly maintained?

1. Pressure loss in the system

2. Backflow into the potable water supply

3. Increased water temperatures

4. Deterioration of pipe materials

The correct answer is: Backflow into the potable water supply

The potential hazard of a double check valve assembly if not properly maintained is backflow into the potable water supply. A double check valve assembly is designed specifically to prevent the reverse flow of water into the drinking water system, which could occur due to changes in pressure or other disturbances. If the assembly is not kept in good working condition—such as failing to check for leaks, obstructions, or deterioration—it can lose its effectiveness. A compromised assembly may allow contaminated water from non-potable sources, like irrigation systems or industrial applications, to flow back into the main potable supply. This poses a significant health risk to consumers, which is the primary reason why routine maintenance and testing are crucial for backflow prevention devices. Issues like pressure loss, increased water temperatures, or deterioration of pipe materials, while they may occur in a plumbing system, do not directly relate to the specific function of preventing backflow in a double check valve assembly.