Cross Connection Practice Exam

Which action should be taken if backflow occurs in a plumbing system?

1. Increase pressure in the system

2. Install a new water line

3. Inspect and repair backflow prevention devices

4. Flush the system with chemicals

The correct answer is: Inspect and repair backflow prevention devices

When backflow occurs in a plumbing system, it indicates that contaminated water is flowing back into the clean water supply, which can pose serious health risks. The correct course of action is to inspect and repair backflow prevention devices. These devices are specifically designed to prevent backflow and protect the potable water supply. If these devices are malfunctioning, they need to be assessed to ensure they are operating correctly. This may involve checking for physical damage, wear, or any obstructions that could hinder their performance. Addressing the integrity of backflow prevention devices is critical in safeguarding drinking water quality. By repairing or replacing these devices as needed, you can effectively restore proper flow and ensure safe water delivery. Other actions, such as increasing pressure in the system, could exacerbate the issue by pushing contaminated water further into the supply. Installing a new water line is unnecessary if the existing system can be repaired. Flushing the system with chemicals may not address the cause of backflow and could introduce harmful substances into the water system, potentially creating new health risks. Therefore, inspecting and repairing backflow prevention devices is the most responsible and effective action to take when dealing with backflow.